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Từ điển Oxford Learners Wordfinder Dictionary
radical
1. (chemistry) two or more atoms bound together as a single unit and forming part of a molecule (Freq. 4)
• Syn:
group, chemical group
• Topics:
chemistry, chemical science
• Hypernyms:
unit, building block
• Hyponyms:
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, cacodyl, cacodyl group, cacodyl radical, arsenic group, carbonyl group,
carboxyl, carboxyl group, chromophore, cyano group, cyano radical, cyanide group,
cyanide radical, glyceryl, hydrazo group, hydrazo radical, hydroxyl, hydroxyl group,
hydroxyl radical, ketone group, methylene group, methylene radical, methylene, propyl,
propyl group, propyl radical, butyl, nitro group, nitrite, uranyl,
uranyl group, uranyl radical, vinyl, vinyl group, vinyl radical
• Part Holonyms:
molecule
2. 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 (Freq. 3)
- in the body free radicals are high-energy particles that ricochet wildly and damage cells
• Syn:
free radical
• Hypernyms:
atom
3. a person who has radical ideas or opinions (Freq. 1)
• Hypernyms:
person, individual, someone, somebody, mortal, soul
• Hyponyms:
anarchist, nihilist, syndicalist, Bolshevik, Marxist,
red, bolshie, bolshy, extremist, leveler, leveller,
revolutionist, revolutionary, subversive, subverter, terrorist, Trotskyite,
Trotskyist, Trot, Wobbly, young Turk
4. (mathematics) a quantity expressed as the root of another quantity
• Topics:
mathematics, math, maths
• Hypernyms:
measure, quantity, amount
5. a character conveying the lexical meaning of a logogram
• Hypernyms:
character, grapheme, graphic symbol
• Part Holonyms:
ideogram, ideograph
6. (linguistics) the form of a word after all affixes are removed
- thematic vowels are part of the stem
• Syn:
root, root word, base, stem, theme
• Derivationally related forms:
stem (for: stem)
• Topics:
linguistics
• Hypernyms:
form, word form, signifier, descriptor
1. (used of opinions and actions) far beyond the norm (Freq. 5)
- extremist political views
- radical opinions on education
- an ultra conservative
• Syn:
extremist, ultra
• Similar to:
immoderate
2. markedly new or introducing radical change (Freq. 4)
- a revolutionary discovery
- radical political views
• Syn:
revolutionary
• Similar to:
new
• Derivationally related forms:
revolution (for: revolutionary)
3. arising from or going to the root or source (Freq. 1)
- a radical flaw in the plan
• Similar to:
basic
4. of or relating to or constituting a linguistic root
- a radical verb form
• Pertains to noun:
root
• Topics:
linguistics
5. 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
- basal placentation
- radical leaves
• Syn:
basal
• Ant:
cauline
• Derivationally related forms:
base (for: basal)
• Topics:
botany, phytology
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