Radical
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Radical 'related to roots', may refer to:
In chemistry:
- A radical (chemistry) is an atom, molecule, or ion with unpaired valence electron(s), that is likely to take part in chemical reactions
In mathematics:
- An nth root
- A radical expression involving roots
- The radical symbol (√), used to indicate the square root and other roots
- 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, an ideal of "bad" elements of a ring
- Radical of a module, a component in the theory of structure and classification
- Jacobson radical, consisting of those elements in a ring R that annihilate all simple right R-modules
- Nilradical of a ring, a nilpotent ideal which is as large as possible
- Nilradical of a Lie algebra, a nilpotent ideal which is as large as possible
- Radical of an integer, in number theory, the product of the primes which divide an integer
- Left (or right) radical of a bilinear form, the subspace of all vectors left (or right) orthogonal to every vector
- Radical of a Lie algebra, a concept in Lie theory
In medicine:
- Radical surgery, surgery carried out in which diseased tissue or lymph nodes are removed from a diseased organ
In linguistics:
- In an inflected language such as English or Spanish, the radical verbs (also called 'radical-changing') are exceptions to the standard patterns of word change (e.g., to be is in most Indo European languages).
- 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 that 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 center, an inclusive centrist philosophy advocating fundamental reform by pragmatic means
- Radical Whigs, influential early writers on Radicalism
- 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
- Radicalization
In religion:
- Radical Reformation, an Anabaptist movement concurrent with the Protestant Reformation
- Radical Christianity
- Radical Islam
- Radical: Taking Back Your Faith from the American Dream, 2010 Christian book
In culture:
- 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
- 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
In entertainment:
- Radical (mixtape), a mixtape by the alternative hip hop collective OFWGKTA
- "Radicals" (song), a song by Tyler, The Creator from his album Goblin
- Free Radicals (band), a jazz-funk musical group from Houston, Texas
- New Radicals, an American pop rock band from the 1990s
- Radical (album), Smack's fourth studio album, released in 1988
- Radical (film), an upcoming film
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 Radical Centre, a centre for free radical chemistry and biotechnology that was established in 2005