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Definition of Radical
1. Adjective. (used of opinions and actions) far beyond the norm. "An ultra conservative"
2. Noun. (chemistry) two or more atoms bound together as a single unit and forming part of a molecule.
Category relationships: Chemical Science, Chemistry
Generic synonyms: Building Block, Unit
Specialized synonyms: Acyl, Acyl Group, Alcohol Group, Alcohol Radical, Aldehyde Group, Aldehyde Radical, Alkyl, Alkyl Group, Alkyl Radical, Allyl, Allyl Group, Allyl Radical, Amino, Amino Group, Amyl, Azido Group, Azido Radical, Azo Group, Azo Radical, Benzyl, Benzyl Group, Benzyl Radical, Benzoyl Group, Benzoyl Radical, Arsenic Group, Cacodyl, Cacodyl Group, Cacodyl Radical, Carbonyl Group, Carboxyl, Carboxyl Group, Chromophore, Cyanide Group, Cyanide Radical, Cyano Group, Cyano Radical, Glyceryl, Hydrazo Group, Hydrazo Radical, Hydroxyl, Hydroxyl Group, Hydroxyl Radical, Ketone Group, Methylene, Methylene Group, Methylene Radical, Propyl, Propyl Group, Propyl Radical, Butyl, Nitro Group, Nitrite, Uranyl, Uranyl Group, Uranyl Radical, Vinyl, Vinyl Group, Vinyl Radical
Group relationships: Molecule
3. Adjective. Markedly new or introducing radical change. "Radical political views"
4. Noun. An atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule that 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"
5. Adjective. Arising from or going to the root or source. "A radical flaw in the plan"
6. Noun. A person who has radical ideas or opinions.
Specialized synonyms: Anarchist, Nihilist, Syndicalist, Bolshevik, Bolshie, Bolshy, Marxist, Red, Extremist, Leveler, Leveller, Revolutionary, Revolutionist, Subversive, Subverter, Terrorist, Trot, Trotskyist, Trotskyite, Wobbly, Young Turk
7. Adjective. Of or relating to or constituting a linguistic root. "A radical verb form"
8. Noun. (mathematics) a quantity expressed as the root of another quantity.
9. Adjective. 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. "Radical leaves"
Category relationships: Botany, Phytology
Derivative terms: Base
Antonyms: Cauline
10. Noun. A character conveying the lexical meaning of a logogram.
11. Noun. (linguistics) the form of a word after all affixes are removed. "Thematic vowels are part of the stem"
Category relationships: Linguistics
Generic synonyms: Descriptor, Form, Signifier, Word Form
Derivative terms: Stem, Stem
Definition of Radical
1. a. Of or pertaining to the root; proceeding directly from the root.
2. n. A primitive word; a radix, root, or simple, underived, uncompounded word; an etymon.
Definition of Radical
1. Adjective. Favouring fundamental change, or change at the root cause of a matter. ¹
2. Adjective. (context: botany not comparable) Of or pertaining to a root (qualifier of a plant). ¹
3. Adjective. Of or pertaining to the intrinsic nature of something. ¹
4. Adjective. Thoroughgoing. ¹
5. Adjective. (context: linguistics not comparable) Of or pertaining to the root of a word. ¹
6. Adjective. (context: chemistry not comparable) Involving free radicals ¹
7. Adjective. (slang) Excellent. ¹
8. Noun. (context: historical: 19th-century England) A member of the most progressive wing of the Liberal Party; someone favouring social reform (but generally stopping short of socialism). ¹
9. Noun. (context: historical: early 20th-century France) A member of an influential, centrist political party favouring moderate social reform, a republican constitution, and secular politics. ¹
10. Noun. A person with radical opinions. ¹
11. Noun. (context: arithmetic) A root (of a number or quantity). ¹
12. Noun. (context: linguistics) 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'''. ¹
13. Noun. (context: linguistics) In Semitic languages, any one of the set of consonants (typically three) that make up a root. ¹
14. Noun. (context: chemistry) A group of atoms, joined by covalent bonds, that take part in reactions as a single unit. ¹
15. Noun. (context: organic chemistry) A free radical. ¹
¹ Source: wiktionary.com
Definition of Radical
1. a group of atoms that acts as a unit in chemical compounds [n -S]
Medical Definition of Radical
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Lexicographical Neighbors of Radical
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