Sea spider Sea spiders, also called Pantopoda or pycnogonids, are marine arthropods of class Pycnogonida. They are cosmopolitan, found especially in the Mediterranean Sea and Caribbean Seas and the Arctic Ocean and Antarctic Oceans.
	Sea star Sea stars or starfish are marine invertebrates belonging to phylum Echinodermata, class Asteroidea. The names sea star and starfish are also used for the closely related brittle stars, which make up the class Ophiuroidea. They exhibit a superficially symmetry#Radial_symmetry.
	Sea turtle Sea turtles are turtles found in all the world's oceans with the exception of the Arctic Ocean, and some species travel between oceans. The Flatback turtle is found solely on the northern coast of Australia. The Leatherback Sea Turtle is the largest, measuring six or seven feet in length at maturity, and three to five feet in width, weighing up to 1300 pounds.
	Sea urchin Sea urchins are spiny sea creatures of the class Echinoidea found in oceans all over the world. . Their shell, which biologists call the test, is globular in shape, and covered with spines. The size of the test in adults is typically in the range of 3 to 10 cm . Typical sea urchins have spines 1-2 cm in length , a millimeter or two thick, and not terribly sharp.
	Seabird Seabirds are birds that have adapted to life in the marine environment. Whilst seabirds vary greatly in lifestyle, behaviour and physiology, they often exhibit striking convergent evolution, as the same environmental problems and feeding ecological niche have resulted in similar adaptations.
	Seafarers Seafarers can refer to ethnic groups living by the sea in Southeast Asia, and also other sea living ethnic groups in the world. The Malay peoples of Southeast Asia traced back the forefathers coming as far as Yunnan some 5000-10000 years ago, they were seafarers that migrated along rivers such as Mekong and Irrawady to the Andaman Sea, South China Sea and various locations in the Malay archipelago, they are known as Orang Laut in the Malay language.
	Seafood Seafood is any sea animal or seaweed that is served as food or is suitable for eating. This usually includes seawater animals, such as fish and shellfish . By extension, in North America although not generally in the United Kingdom, the term seafood is also applied to similar animals from fresh water and all edible aquatic animals are collectively referred to as seafood.
	Seagrass Seagrass are flowering plants from four plant families that grow in the marine saline environment. They are called seagrasses only because most species superficially resemble terrestrial Poaceaees of the Family Poaceae. Because these plants must photosynthesis, they are limited to growing submerged in the photic zone, and most occur in shallow and sheltered coastal waters anchored in sand or mud bottoms.
	Seahorse Seahorses are marine fish belonging to the genus Hippocampus of the family Syngnathidae, which also includes pipefish. They are found in temperate and tropical waters all over the world. Seahorses range in size from 16 mm to 35 cm. They are notable for being the only species where the males become male pregnancy.
	Seal Seal or SEAL may refer to articles connected to a variety of meanings of the word: A marine mammal: *Seal, a large marine mammal: see pinniped within which there are three main groups: **Earless seals , members of the family Phocidae **Eared seals , members of the family Otariidae, which includes:
	Sealyham Terrier image = SealyhamTerrier2.jpg | akcgroup = Terrier | akcstd = ankcgroup = Group 2 | ankcstd = ckcgroup = Group 4 - Terrier | ckcstd = country = United Kingdom | fcigroup = 3 | fcinum = 074 | fcisection = 2 | fcistd = kcukgroup = Terrier | kcukstd = name = Sealyham Terrier | nzkcgroup = Terrier | nzkcstd = ukcgroup = Terriers
	Seaman Seaman can be a generic term for male sailor.Seaman as a rank refers to the one of the lowest ranks in a navy. In Commonwealth of Nations context it refers to the lowest rank in the navy, followed by Able Seaman and Leading Seaman, and followed by the Petty Officer ranks.
	Seamount A seamount is a mountain rising from the ocean seafloor that does not reach to the water's surface, and thus is not an island. These are typically formed from extinct volcanos, that rise abruptly and are usually found rising from a seafloor of 1,000 4,000 metres depth. They are defined by Oceanography as independent features that rise to at least 1,000 metres above the seafloor.
	Seanad Éireann Seanad ireann, also known unofficially as the Senate, is the upper house of the Oireachtas of the Republic of Ireland. Unlike the lower house, Dil ireann, the Senate is not directly elected but consists of a mixture of members chosen by various methods. Its powers are much weaker than those of the Dil and it can only delay laws with which it disagrees, rather than veto them outright.
	Seaplane A seaplane is a fixed-wing aircraft designed to take off and land upon water. These aircraft are occasionally called hydroplanes, based on usage in several Romance languages, which is rare in English language.
	Seaport A seaport is a facility for receiving seafaring ships and transferring cargo to and from them. They are usually situated at the edge of an ocean, sea, river, or lake. Ports often have cargo-handling equipment such as Crane and forklifts for use in loading/unloading of ships, which may be provided by private interests or public bodies.
	Search engine A search engine or search service is a computer program designed to help find information stored on a computer system such as the World Wide Web, inside a corporate or proprietary network or a personal computer. The search engine allows one to ask for content meeting specific criteria and retrieves a list of references that match those criteria.
	Searchlight A searchlight is an apparatus with reflectors for projecting a powerful beam of light of approximately parallel rays in a particular direction, usually devised so that it can be swiveled about. Searchlights were first used in World War I to create "artificial moonlight" to enhance opportunities for night attacks, a practice which continued in World War II.
	Seashore mallow Seashore mallow also known as Sweat weed or Virginia saltmarsh mallow, and Salt Marsh Mallow is an herb found in marshes along the easternL seashore of the United States. This flowering plant is in family Malvaceae of the order Malvales.
	Season A season is one of the major divisions of the year, generally based on yearly periodic changes in weather. In temperate and Polar climate regions generally four seasons are recognized: spring , summer, autumn , and winter. In some tropics and subtropical regions it is more common to speak of the wet season season versus the dry season, as the amount of Precipitation may vary more dramatically than the average temperature.
	SEAT d align="center" valign='center' width="33%"> * SEAT 850 * SEAT 1200 Sport * SEAT 1400 * SEAT 1430 * SEAT 1500 * SEAT 124 * SEAT 127 * SEAT 128 * SEAT 131 * SEAT 132 * SEAT 133 * SEAT Fura * SEAT Panda * SEAT Ritmo * SEAT Ronda * SEAT Terra
	Seat belt A seat belt, sometimes called a safety belt, is a harness designed to hold the occupant of a automobile or other vehicle in place if a collision occurs or, more commonly, if it stops suddenly. Seat belts are intended to reduce injury by stopping the wearer from hitting hard interior elements of the vehicle or from being thrown from the vehicle.
	Seawall A seawall is a form of hard coastal defense constructed on the inland part of a coast to reduce the effects of strong waves and to defend the coast around a town or harbour from erosion. The walls can be sloping, vertical or curved to reflect wave power. The term is typically used to describe walls built on the land parallel to the coast, but may also apply to breakwaters and groynes which are built in the water.
	Seawater Seawater is water from a sea or ocean. On average, seawater in the world's oceans has a salinity of ~3.5%. This means that for every 1 litre of seawater there are 35 grams of salts dissolved in it. This can be expressed as 0.6molar solution NaCl or 0.6 mole·Liter-1.
	Seaweed Biologists, specifically marine biologists, consider seaweed to be any of a large number of ocean benthos algae that are multicellular, macrothallic, and thus differentiated from most algae that tend to be microscopic in size . Many phycologists prefer the term "marine macroalgae" over "seaweeds".
	Sebaceous gland The sebaceous glands are glands found in the skin of mammals. They secrete an oily substance called sebum that is made of fat and the debris of dead fat-producing cells. These glands exist in humans throughout the skin except in the palms of the hands and soles of the feet. Sebum acts to protect and waterproof hair and skin, and keep them from becoming dry, brittle, and cracked.
	Sebacic acid Sebacic acid is a bi-carboxylic acid with structure(CH2)8(COOH), and is naturally occurring. In its pure state it is a white flake or powdered crystal. The product is described as non-hazardous, though in its powdered form can be prone to flash ignition. Sebaceus is Latin for tallow candle, sebum is Latin for tallow, and refers to its use in the manufacture of candles.
	Sebastián Vizcaíno Sebasti?n Vizca?no (1548-1624) was a Spanish soldier, entrepreneur, explorer, and diplomat whose varied roles took him to New Spain, the Philippines, the Baja California peninsula, Alta California, and Japan.
	Secale Secale is a genus in the Poaceae family. The most known member is rye. Category:Poales es:Secale fr:Secale
	Secateurs Secateurs, also called hand pruners or pruning shears, are a type of scissors for use with plants. They are strong enough to pruning hard branches of trees and shrubs, sometimes up to two centimetres thick. They are used in gardening and flower arranging, and in nature conservation where fine-scale habitat management is required.
	Secobarbital Secobarbital is a drug which is a barbiturate derivative. It possesses anaesthetic, anticonvulsant, sedative and hypnotic properties. Was previously known as quinalbarbitone in the UK.
	Second baseman Second base, or 2B, is the second of four stations on a baseball diamond which must be touched in succession by a base runner in order to score a run for that player's team. A second baseman is the baseball player guarding second base. Also called 2B, or second bagger, the second baseman often possesses quick hands and feet, needs the ability to get rid of the ball quickly, and must be able to make the pivot on a double play.
	Second Battle of Ypres The Second Battle of Ypres was the first time Germany used chemical weapons on a large scale on the Western Front in World War I and the first time a colonial force forced back a major European power on European soil, which occurred in the battle of St. Juliaan-Kitcheners' Wood.
	Second Childhood Second Childhood is the second album by singer/songwriter Phoebe Laub, released in 1976.
	Second Crusade The Second Crusade was the second major crusade launched from Europe, called in 1145 in response to the fall of the County of Edessa the previous year. Edessa was the first of the Crusader states to have been founded during the First Crusade, and was the first to fall. The Second Crusade was announced by Pope Eugene III, and was the first of the crusades to be led by European kings, namely Louis VII of France and Conrad III of Germany, with help from a number of other important European nobles.
	Second Empire Second Empire is an architectural style that was popular during the Victorian era, reaching its zenith between 1865 and 1880, and so named for the France elements in vogue during the era of the Second French Empire. While a distinct style unto itself, some Second Empire styling cues, such as Quoin, have an indirect relationship to the styles previously in vogue, Gothic Revival and Italianate eras.
	Second law of thermodynamics The second law of thermodynamics is an axiom of nature regarding the directional flow of heat in relation to thermodynamic work and which accounts for the phenomenon of irreversibility in thermodynamic systems. The most common enunciation of second law of thermodynamics is:
	Second Lieutenant Second Lieutenant is the lowest commissioned officer in many armed forces.
	Secondary cell A secondary cell is any kind of electrolytic cell in which the electrochemistry chemical reaction that releases energy is reversible. Widespread examples are rechargeable batteries found in portable consumer electronics such as notebook computers and cell phones, and car batteries.
	Secondary education In most contemporary educational systems of the world, secondary education is a stage of formal education characterised by transition from the typically compulsory, comprehensive primary education for minor s to the optional, selective Tertiary education, "post-secondary", or "Higher education" education for adults.
	Secondary sex characteristic Secondary sex characteristics are traits that distinguish the two sexes of a species, but that are not directly part of the reproductive system. Some have argued that in general they evolution to give an individual an advantage over its rivals in courtship. They are opposed to the primary sexual characteristics: the sex organs.
	Secret Agent Secret Agent is a 1936 United Kingdom film directed by Alfred Hitchcock based on a novel by W. Somerset Maugham. The film starred John Gielgud, Peter Lorre, Madeleine Carroll and Robert Young Gielgud plays a United Kingdom officer, who had been a famed writer before the war, whose death is faked before being sent by the head of British intelligence, "R", to Switzerland on a secret mission.
	Secret ballot The secret ballot is a voting method in which a voter's choices are confidential. The key aim is to ensure the voter records a sincere choice by forestalling attempts to influence the voter by intimidation or bribery. The system is one means of achieving the goal of political privacy.
	Secret Intelligence Service The Secret Intelligence Service , more commonly known as MI6, or the Secret Service or simply Six, is the United Kingdom's external security agency. Insiders sometimes refer to it as box 850 which comes from its old postal box number. SIS is responsible for the United Kingdom's espionage activities overseas, as opposed to MI5 which is charged with internal security within the UK.
	Secretary Bird The Secretary Bird, Sagittarius serpentarius, is an extraordinary bird of prey. Endemic to Africa, this mostly terrestrial bird is usually found in the open grasslands and savannas of the sub-Sahara. It is a large bird of prey in the order Falconiformes, which also includes many other diurnal Bird of preys such as kites, buzzards, vultures, and harriers, but it is so distinctive that it is given its own family, Sagittaridae.
	Secretase Secretases are enzymes that "snip" pieces off a longer protein that is embedded in the cell membrane. Among other roles in the Cell, secretases act on the amyloid precursor protein to cleave the protein into three fragments. Sequential cleavage by Beta-secretase and gamma-secretase produces the Abeta peptide fragment that aggregates into clumps called "plaques" in the brains of Alzheimer's disease patients.
	Sector A sector is a part of a whole. As a well the specific usages below, it can also be used metaphorically, referring to a generic piece or portion of something. *Sector, West Virginia is an unincorporated community in West Virginia, in the United States. * sector can refer to a geography subdivision, zone, region, area, especially one that is assigned to a military control.
	Secular games Secular games. These were celebrated at Rome for three days and nights to mark the commencement of a new saeculum or generation. It is important to note that there was a saeculum civile, the length of which was definitely fixed at 100 years, and a saeculum naturale, which, under Greek and
	Secularism Secularity is the state of being free from religious or spiritual qualities. For instance, eating a meal, playing a game, or bathing are examples of secular activities, because there is nothing inherently religious about them. Saying a prayer or visiting a place of worship are examples of non-secular activities.
	Security Security is the condition of being protected against danger or loss. In the general sense, security is a concept similar to safety. The nuance between the two is an added emphasis on being protected from dangers that originate from outside. Individuals or actions that encroach upon the condition of protection are responsible for the breach of security.
	Sedan A sedan automobile, American English terminology, is one of the most common car body style of the modern automobile. At its most basic, the sedan is a passenger car with a separate hood, covering the engine in the front, and a separate Trunk, for luggage at the rearthe archetypical "3-box" car.
	Sedge Warbler The Sedge Warbler is an Old World warbler in the genus Acrocephalus. It breeds across Europe and western and central Asia. It is bird migration, wintering in sub-Saharan Africa. This small passerine bird is a species found in reed beds with bushes.
	Sedge Wren The Sedge Wren, Cistothorus platensis, is a small songbird of the Wren family. Adults have brown upperparts with a light brown belly and flanks and a white throat and breast. The back has pale streaks. They have a dark cap with pale streaks, a faint line over the eye and a short thin bill.
	Sediment Sediment is any particulate matter that can be transported by fluid flow and which eventually is deposited as a layer of solid particles on the bed or bottom of a body of water or other liquid. Sedimentation is the deposition by settling of a suspension material. Sediments are also transported by wind and glaciers.
	Sedimentary rock Sedimentary rock is one of the three main rock groups and is formed in three main ways—by the deposition of the weathered remains of other rocks ; by the accumulation and the consolidation of sediments;by the deposition of the results of biogenic activity; and by precipitation from solution.
	Sedum Sedum is a large genus of the Crassulaceae, representing about 400 species of leaf succulents, found throughout the northern hemisphere, varying from annual groundcovers to shrubs. The plants have water-storing leaves and a typical form of blossom with five petals, seldom four or six.
	Seed A seed is the ripened ovule of gymnosperm or Flowering plant plants. The importance of the seed relative to more primitive forms of reproduction and dispersal is attested to by the success of these two groups of plants in dominating the landscape.
	Seeded Seeding a flow, or a seeded flow, means to introduce particulates or other foreign substances into an otherwise transparent stream of fluid. These particulates are generally small enough to be carried by the fluid but large enough to be picked up using a flow visualization technique, such as particle image velocimetry.
	Seel is one of fictional species of the Pokmon franchise. The name Seel is probably a deliberate misspelling of the word seal, regarding its seal-like form. In the Advance Generation, a similar Pokmon was created, Spheal, though the latter is more rotund in physique and has a notably different color.
	Seesaw A seesaw is a long, narrow board suspended in the middle so that, as one end goes up, the other goes down. In a playground setting, the board is balanced in the exact center. A person sits on each end and they take turns pushing their feet against the ground to lift their end into the air.
	Seething The church of Seething St Margaret is one of 124 existing round-tower churches in Norfolk.
	Sei Whale The Sei Whale is a large baleen whale. Following large-scale hunting of Sei Whales in the Southern Ocean during middle part of the twentieth century when approximately 200,000 individuals were killed, the Sei Whale is now an internationally protected species. The Sei Whale can grow to 20 m long.
	Seiche A seiche is a standing wave in an enclosed or partially enclosed body of water. Seiches and seiche-related phenomena have been observed on lakes, Reservoirs, bays and seas. The key requirement for formation of a seiche is that the body of water be at least partially bounded, allowing natural phenomena to form a standing wave.
	Seine The Seine is a major river of north-western France, and one of its commercial waterways. It is also a tourist attraction, particularly within the city of Paris.
	Seismogram A seismogram is a graph output by a seismograph. It is a record of the ground motion at a measuring station. The energy measured in a seismogram may result from an earthquake or from some other source, such as an explosion. Because P-waves travel through the earth faster than other types of waves, the P-wave is the first arrival of energy from an earthquake or other seismic source to be recorded.
	Seismology Seismology is the scientific study of earthquakes and the movement of waves through the Earth. The field also includes studies of variants such as seaquakes, as well as causes such as volcanoes and tectonic plates. A related field is paleoseismology. Earthquakes, and other earth movements, produce different types of seismic waves.
	Seismosaurus Seismosaurus, meaning "Earth-shaking lizard," was one of the giant sauropods of the late Jurassic period. It lived from the Kimmeridgian to the Tithonian age, approximately 154 to 144 million years ago. From snout to tail, Seismosaurus is estimated to have been 110 feet long, making it one of the longest dinosaurs.
	Seiurus The genus Seiurus consists of three species of bird in the New World warbler family Parulidae. They are terrestrial feeders always found near water. Two of the species, the waterthrushes, are very similar; they are * Louisiana Waterthrush, Seiurus motacilla * Northern Waterthrush, Seiurus noveboracensis
	Seldom Seldom was a Seattle, Washington-based pop-rock trio. Their set-up consisted of piano, bass guitar, and drum set, but some songs included electric guitar, mellotron, string instrument, or other keyboard instruments.
	Selection In the context of evolution, certain traits or alleles of a species may be subject to selection. Under selection, individuals with advantageous or Adaptation traits tend to be more successful than their peers reproductively--meaning they contribute more offspring to the succeeding generation than others do.