• Fissure (dentistry), a break in the tooth enamel
• Skin fissure
  Skin fissure
  A skin fissure is a cutaneous condition in which there is a linear-like cleavage of skin, sometimes defined as extending into the dermis. It is smaller than a skin laceration.-Generalized:...
  
  
• Fissure of the nipple, a condition that results from running, breastfeeding and other friction-causing exposures
• Fissured tongue
  Fissured tongue
  Fissured tongue is a benign condition characterized by deep grooves in the dorsum of the tongue...
  
  , a condition characterized by deep grooves (fissures) in the tongue
• Fissure vent
  Fissure vent
  A fissure vent, also known as a volcanic fissure or simply fissure, is a linear volcanic vent through which lava erupts, usually without any explosive activity. The vent is usually a few meters wide and may be many kilometers long. Fissure vents can cause large flood basalts and lava channels...
  
  , a linear volcanic vent through which lava erupts, usually without any explosive activity
• Ice fissure, deep fracture or crevasse in glaciology

See also

• Fracture (geology), a fissure or crevice in rock
• Sulcus (anatomy)
  Sulcus (anatomy)
  A sulcus is a depression or fissure in the surface of an organ, especially the brain.-Elsewhere:* anterior interventricular sulcus* calcaneal sulcus* coronal sulcus* gingival sulcus* gluteal sulcus* interlabial sulci...
  
  
• Sulcus (neuroanatomy)
  Sulcus (neuroanatomy)
  In neuroanatomy, a sulcus is a depression or fissure in the surface of the brain.It surrounds the gyri, creating the characteristic appearance of the brain in humans and other large mammals....