Radical

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

in science and mathematics

• A radical (chemistry) is an atom, molecule, or ion which is likely to take part in chemical reactions.
• Radical symbol (√), a 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 a ring, in ring theory, a branch of mathematics, a radical of a ring is an ideal of "bad" elements of the ring
• Radical of a module, in the theory of modules, the radical of a module is a component in the theory of structure and classification
• Jacobson radical, the Jacobson radical of a ring, R, consists of those elements in R which annihilate all simple right R-modules
• Nilradical of a ring, the nilradical of a commutative ring is a nilpotent ideal, which is as large as possible
• Nilradical of a Lie algebra, the nilradical of a lie algebra is a nilpotent ideal, which is as large as possible
• 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

in medicine

• Radical surgery, surgery carried out in extreme circumstances and/or with extensive treatment

in linguistics

• Root (linguistics), also called a "radical", the form of a word after any prefixes and suffixes are removed
• Radical (Chinese character), part of a Chinese character under which it is indexed in a dictionary (also called bùshǒu 部首)
• Radical, one of the three consonants in a Semitic root
• Radical consonant, a consonant articulated with the root of the tongue

in politics

• 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
  • radical - a person who shows a strong political stand point

Extremism, political standpoints that are perceived as revolutionary or extreme

• Radical Whigs, influential early writers on Radicalism
• Radical Reformation, an Anabaptist movement at the time of the Protestant Reformation
• Radical Republicans, 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
• Radical feminism, a current within feminism that focuses on patriarchy as a system of power
• Radical veganism, a radical interpretation of veganism, usually combined with anarchism

in culture

• Radical chic, a term coined by Tom Wolfe to describe the pretentious adoption of radical causes by celebrities, socialites, and high society

in architecture

• Radical Baroque, an architectural style characterized by the curvature of walls and intersection of oval spaces

brands, titles and proper names

• Radical Sportscars, an English sports car maker
• Radical Entertainment, a video game developer based in Vancouver, Canada
• Free Radical Design, a video game developer based in Nottingham, England
• Free Radicals (band), a jazz-funk musical group from Houston, Texas
• Free Radical Centre, a centre for free radical chemistry and biotechnology that was established in 2005
• Radical (Smack album), Smack's fourth studio album, released in 1988

This disambiguation page lists articles associated with the title Radical. If an internal link led you here, you may wish to change the link to point directly to the intended article.