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(1)   Especially of leaves; located at the base of a plant or stem; especially arising directly from the root or rootstock or a root-like stem
"Basal placentation"
"Radical leaves"
(2)   (used of opinions and actions) far beyond the norm
"Extremist political views"
"Radical opinions on education"
"An ultra conservative"
(3)   Markedly new or introducing radical change
"A revolutionary discovery"
"Radical political views"
(4)   Arising from or going to the root
"A radical flaw in the plan"
(5)   Of or relating to or constituting a linguistic root
"A radical verb form"


(6)   (linguistics) the form of a word after all affixes are removed
"Thematic vowels are part of the stem"
(7)   A sign placed in front of an expression to denote that a root is to be extracted
(8)   A character conveying the lexical meaning of a logogram
(9)   A person who has radical ideas or opinions
(10)   (chemistry) two or more atoms bound together as a single unit and forming part of a molecule
(11)   An atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule than has lost an electron and will stabilize itself by stealing an electron from a nearby molecule
"In the body free radicals are high-energy particles that ricochet wildly and damage cells"


< < < ; see radix.


  1. Favouring fundamental change, or change at the root cause of a matter.
    His beliefs are radical.
  2. Of or pertaining to a root .
  3. Of or pertaining to the intrinsic nature of something.
  4. Thoroughgoing.
    The spread of the cancer required radical surgery, and the entire organ was removed.
  5. Of or pertaining to the root of a word.
  6. Involving free radicals
  7. Excellent.
    That was a radical jump!


  1. A member of the most progressive wing of the Liberal Party; someone favouring social reform (but generally stopping short of socialism).
  2. A member of an influential, centrist political party favouring moderate social reform, a republican constitution, and secular politics.
  3. A person with radical opinions.
  4. A root (of a number or quantity).
  5. In logographic writing systems as the Chinese writing system, the portion of a character (if any) that provides an indication of its meaning, as opposed to phonetic.
  6. In Semitic languages, any one of the set of consonants (typically three) that make up a root.
  7. A group of atoms, joined by covalent bonds, that take part in reactions as a single unit.
  8. A free radical.


  1. radical