English dictionary



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English adjective: radical

1. radical (used of opinions and actions) far beyond the norm


SamplesExtremist political views.
Radical opinions on education.
An ultra conservative.


Synonymsextremist, ultra


Similarimmoderate


Antonymsmoderate

2. radical markedly new or introducing radical change


SamplesA revolutionary discovery.
Radical political views.


Synonymsrevolutionary


Similarnew


Antonymsold

3. radical arising from or going to the root or source


SamplesA radical flaw in the plan.


Similarbasic


Antonymsincidental, incident

4. radical of or relating to or constituting a linguistic root


SamplesA radical verb form.


Domain categorylinguistics

5. radical 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


SamplesBasal placentation.
Radical leaves.


Synonymsbasal


Domain categorybotany, phytology


Antonymscauline


English noun: radical

1. radical (substance) (chemistry) two or more atoms bound together as a single unit and forming part of a molecule


Synonymschemical group, group


Broader (hypernym)building block, unit


Narrower (hyponym)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, arsenic group, azido group, azido radical, azo group, azo radical, benzoyl group, benzoyl radical, benzyl, benzyl group, benzyl radical, butyl, 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, nitrite, nitro group, propyl, propyl group, propyl radical, uranyl, uranyl group, uranyl radical, vinyl, vinyl group, vinyl radical


Part meronymmolecule


Domain categorychemical science, chemistry

2. radical (substance) 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


SamplesIn the body free radicals are high-energy particles that ricochet wildly and damage cells.


Synonymsfree radical


Broader (hypernym)atom

3. radical (person) a person who has radical ideas or opinions


Broader (hypernym)individual, mortal, person, somebody, someone, soul


Narrower (hyponym)anarchist, Bolshevik, bolshie, bolshy, extremist, leveler, leveller, Marxist, nihilist, red, revolutionary, revolutionist, subversive, subverter, syndicalist, terrorist, Trot, Trotskyist, Trotskyite, Wobbly, young Turk

4. radical (quantity) (mathematics) a quantity expressed as the root of another quantity


Broader (hypernym)amount, measure, quantity


Domain categorymath, mathematics, maths

5. radical (communication) a character conveying the lexical meaning of a logogram


Broader (hypernym)character, grapheme, graphic symbol


Part meronymideogram, ideograph

6. radical (communication) (linguistics) the form of a word after all affixes are removed


SamplesThematic vowels are part of the stem.


Synonymsbase, root, root word, stem, theme


Broader (hypernym)descriptor, form, signifier, word form


Domain categorylinguistics









Based on WordNet 3.0 copyright © Princeton University.
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