Radicals

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Radical (from Late Latin radicalis "of roots", from Latin radix "root") may refer to:

In chemistry, a radical is an atom, molecule, or ion which is likely to take part in chemical reactions.
The symbol √ used to indicate the square root or nth root
Radical of an algebraic group, a concept in algebraic group theory
Radical of an ideal, an important concept in abstract algebra
Radical of an integer, a concept in number theory
Symmetric bilinear form, a concept in linear algebra
Radical of a Lie algebra, a concept in Lie theory

of a root (linguistics)
Radical (Chinese character), part of a Chinese character under which it is indexed in a dictionary (also called bùshǒu 部首)
One of the three consonants in a Semitic root
Radical consonant, which involves the root of the tongue

Political radicalism
- Radicalism (historical), the Radical Movement which began in late 18th century Britain and spread to continental Europe and Latin America in the 19th century
- Radical left, another term for the far left
- Radical right, another term for the far right
- Extremism, political standpoints that are perceived as revolutionary or extreme
Radical Whigs, influential early writers on Radicalism
Radical Reformation, an Anabaptist movement concurrent with the Protestant Reformation
Radical Republican (USA), a member of an influential group of American politicians during the Civil War reconstruction
Radical Party, one of a number of political parties around the world
Radicals (UK), parliamentary progressives who were part of the nineteenth-century Liberal coalition

See also