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radical

1 Relating to, consisting of, or going to the root or fundament; necessitating, entailing, or favouring fundamental social, economic, or political change. n. ...

radical

radical   Quick reference

A Dictionary of Physics (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Physics
Length:
17 words

...radical A root of a number or a quantity. The symbol √ is called the radical sign...

radical

radical   Reference library

Oxford Dictionary of Biochemistry and Molecular Biology (2 ed.)

Reference type:
Subject Reference
Current Version:
2008
Subject:
Science and technology, Life Sciences
Length:
90 words

... (in chemistry) 1 any molecular entity, charged or uncharged, that possesses an unpaired electron (but normally excluding any paramagnetic metal ion); often formed by homolysis of a covalent bond. Radical character is indicated in a formula by a centred dot symbolizing the unpaired electron and placed (if possible) beside the symbol for the atom of highest spin density; e.g. HOO·, ·CH 3 . The term free radical is now preferably restricted to any radical that does not form part of a radical pair . 2 a former name for group (def....

radical

radical   Quick reference

A Dictionary of Chemistry (8 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Science and technology, Chemistry
Length:
27 words

... A group of atoms, either in a compound or existing alone. See free radical ; functional group . https://www.acdlabs.com/iupac/nomenclature/93/r93_569.htm Information about IUPAC nomenclature https://www.acdlabs.com/iupac/nomenclature/79/r79_1036.htm List of radical...

Radical

Radical   Reference library

Brewer's Dictionary of Phrase & Fable (19 ed.)

Reference type:
Subject Reference
Current Version:
2013

...Opposition. Radical chic The fashionable affectation of radical left-wing views. The expression was coined by the US writer Tom Wolfe in 1970 to denote high society’s adoption of radicals and radical issues as fashion accessories. The term subsequently came to apply to anything left-wing that seemed to be embraced on grounds of being fashionable rather than through personal conviction. Radical Chic … is only radical in Style; in its heart it is part of Society and its tradition – Politics, like Rock, Pop, and Camp, has its uses. Radical Jack John George...

radical

radical   Quick reference

A Dictionary of Plant Sciences (4 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Life Sciences
Length:
19 words

... Applied to a leaf that arises from a rhizome or from the base of a...

radical

radical   Quick reference

The Oxford Dictionary of English Grammar (2 ed.)

Reference type:
Subject Reference
Current Version:
2014

... Morphology ( n. & adj. ) (Of, belonging to, connected with, or based on) the root of a word . The term has a long history, but words such as base , root , and stem (along with morpheme and minimum free form ) are more usual...

radical

radical adj.   Quick reference

A Dictionary of Psychology (4 ed.)

Reference type:
Subject Reference
Current Version:
2015

... adj . 1. Relating to, consisting of, or going to the root or fundament; necessitating, entailing, or favouring fundamental social, economic, or political change. n . 2. A group of atoms that is unstable in the free state but when bound together in a molecule behaves as a single unit, such as the acetyl group —COCH 3 . See also free radical . [From Latin radix a root + ‐ icalis of, relating to, or...

radical

radical   Quick reference

The Concise Oxford Dictionary of Linguistics (3 ed.)

Reference type:
Subject Reference
Current Version:
2014
Subject:
Linguistics
Length:
104 words

... 1. Of, in, etc. a root ( 1 ) . 2. One of a set of smaller elements, corresponding to semantic categories, into which characters in Chinese writing are analysed and by which they are classified and grouped in dictionaries. 3. (Sound) articulated with the root or ‘radix’ of the tongue: i.e. with the back as opposed to the upper surface. Also taken to include sounds articulated with the epiglottis. 4. In the general sense of ‘taken to an extreme’. E.g. radical pragmatics is a treatment of meaning which reduces the role of semantics, seen as separate...

radical

radical adj.   Reference library

Garner’s Modern English Usage (4 ed.)

Reference type:
Subject Reference
Current Version:
2016
Subject:
Language reference, Usage and Grammar Guides
Length:
136 words

... , adj. , = (1) of, relating to, or involving a root or foundation <the radical selfishness of human nature> ; or (2) far-reaching, extreme, sweeping <a radical proposal> . It's sometimes misspelled radicle —e.g.: “This radicle [read radical ] approach to bifurcation would make any class certification a foregone conclusion.” “Ninth Circuit Denies Red Cross Mandamus Request in AZ Blood Class Action,” Pharmaceutical Litig. Rptr . , July 1996 , at 11,449. Actually, radicle is a noun meaning “a small root”—e.g.: • “If everything's in sync, the...

radical ion

radical ion   Reference library

Oxford Dictionary of Biochemistry and Molecular Biology (2 ed.)

Reference type:
Subject Reference
Current Version:
2008
Subject:
Science and technology, Life Sciences
Length:
45 words

... ion any radical (def. 1) that carries an electric charge. One carrying a negative charge is termed a radical anion (e.g. the benzene radical anion, C 6 H 6 · − ); one carrying a positive charge is termed a radical cation (e.g. the benzene radical cation, C 6 H 6 · +...

radical scavenger

radical scavenger   Quick reference

A Dictionary of Genetics (8 ed.)

Reference type:
Subject Reference
Current Version:
2014
Subject:
Science and technology, Life Sciences
Length:
31 words

... scavenger a molecule with a high affinity for free radicals. If a radical scavenger is added to a biological system prior to irradiation, it may act as a protective...

radical ion

radical ion   Quick reference

A Dictionary of Chemistry (8 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Science and technology, Chemistry
Length:
41 words

... ion A radical that has a positive or negative charge. An example is the benzene radical cation C 6 H 6 .+ . In radical ions, the odd electron and the charge are usually (but not necessarily) on the same...

hydroxyl radical

hydroxyl radical   Quick reference

A Dictionary of Chemistry (8 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Science and technology, Chemistry
Length:
39 words

...radical The free radical OH, which has an unpaired electron. This makes the hydroxyl radical very reactive and short lived. It is an important entity in free radical chemistry, particularly in atmospheric chemistry and photocatalysts...

radical bass

radical bass   Quick reference

The Oxford Dictionary of Music (6 ed.)

Reference type:
Subject Reference
Current Version:
2013
Subject:
Music
Length:
10 words

... bass Same as fundamental bass; roots of various...

radical centre

radical centre   Reference library

Oxford Dictionary of Biochemistry and Molecular Biology (2 ed.)

Reference type:
Subject Reference
Current Version:
2008
Subject:
Science and technology, Life Sciences
Length:
18 words

... centre the atom in any polyatomic radical (def. 1) on which the unpaired electron is largely...

hydroperoxyl radical

hydroperoxyl radical   Quick reference

A Dictionary of Genetics (8 ed.)

Reference type:
Subject Reference
Current Version:
2014
Subject:
Science and technology, Life Sciences
Length:
19 words

...radical HO 2 , an oxidizing agent formed during the interaction of ionizing radiation with oxygenated water. See free radical...

free radical

free radical   Quick reference

The Oxford Dictionary of Sports Science & Medicine (3 ed.)

Reference type:
Subject Reference
Current Version:
2007

...radical A chemical group that has unshared electrons available for a reaction. Free radicals can damage the integrity of DNA and have been implicated as a cause of cancers. Antioxidants, such as vitamin C and vitamin E, neutralize free radicals...

‘radical creole’

‘radical creole’   Quick reference

The Concise Oxford Dictionary of Linguistics (3 ed.)

Reference type:
Subject Reference
Current Version:
2014
Subject:
Linguistics
Length:
15 words

...radical creole’ One thought to have been formed by a process of ‘abrupt’ creolization...

radical SAM

radical SAM   Reference library

Oxford Dictionary of Biochemistry and Molecular Biology (2 ed.)

Reference type:
Subject Reference
Current Version:
2008
Subject:
Science and technology, Life Sciences
Length:
20 words

... SAM refers to enzymes that bind S‐adenosyl‐ l ‐methionine ( SAM ) next to a [4Fe‐4S] cluster to generate a reactive free‐radical...

free radical

free radical   Quick reference

A Dictionary of Chemistry (8 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Science and technology, Chemistry
Length:
52 words

...radical An atom or group of atoms with an unpaired valence electron. Free radicals can be produced by photolysis or pyrolysis in which a bond is broken without forming ions ( see homolytic fission ). Because of their unpaired valence electron, most free radicals are extremely reactive. See also chain reaction...

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