radical


Also found in: Thesaurus, Medical, Legal, Financial, Acronyms, Idioms, Encyclopedia, Wikipedia.

rad·i·cal

 (răd′ĭ-kəl)
adj.
1. Arising from or going to a root or source; basic: proposed a radical solution to the problem.
2. Departing markedly from the usual or customary; extreme or drastic: a radical change in diet.
3. Relating to or advocating fundamental or revolutionary changes in current practices, conditions, or institutions: radical politics; a radical political theorist.
4. Medicine Relating to or being surgery that is extreme or drastic in an effort to eradicate all existing or potential disease: radical hysterectomy.
5. Linguistics Of or being a root: a radical form.
6. Botany
a. Of, relating to, or arising from a root: radical hairs.
b. Arising from the base of a stem or from a below-ground stem or rhizome: radical leaves.
7. Slang Excellent; wonderful.
n.
1. One who advocates fundamental or revolutionary changes in current practices, conditions, or institutions: radicals seeking to overthrow the social order.
2. Mathematics The root of a quantity as indicated by the radical sign.
3. Symbol R An atom or a group of atoms with one unpaired electron.
4. Linguistics See root1.
5.
a. Any of the basic Chinese characters that are combined to form more complex characters.
b. Any of the traditional set of basic strokes or groups of strokes that make up Chinese characters and are used to classify and organize them in dictionaries.

[Middle English, of a root, from Late Latin rādīcālis, having roots, from Latin rādīx, rādīc-, root; see wrād- in Indo-European roots.]

rad′i·cal·ly adv.
rad′i·cal·ness n.

radical

(ˈrædɪkəl)
adj
1. of, relating to, or characteristic of the basic or inherent constitution of a person or thing; fundamental: a radical fault.
2. concerned with or tending to concentrate on fundamental aspects of a matter; searching or thoroughgoing: radical thought; a radical re-examination.
3. (Government, Politics & Diplomacy) favouring or tending to produce extreme or fundamental changes in political, economic, or social conditions, institutions, habits of mind, etc: a radical party.
4. (Medicine) med (of treatment) aimed at removing the source of a disease: radical surgery.
5. slang chiefly US very good; excellent
6. (Botany) of, relating to, or arising from the root or the base of the stem of a plant: radical leaves.
7. (Mathematics) maths of, relating to, or containing roots of numbers or quantities
8. (Linguistics) linguistics of or relating to the root of a word
n
9. (Government, Politics & Diplomacy) a person who favours extreme or fundamental change in existing institutions or in political, social, or economic conditions
10. (Mathematics) maths a root of a number or quantity, such as 3√5, √x
11. (Chemistry) chem
a. short for free radical
b. another name for group10
12. (Linguistics) linguistics another word for root19
13. (Linguistics) (in logographic writing systems such as that used for Chinese) a part of a character conveying lexical meaning
[C14: from Late Latin rādīcālis having roots, from Latin rādix a root]
ˈradicalness n

rad•i•cal

(ˈræd ɪ kəl)

adj.
1. of or going to the root or origin; fundamental.
2. thoroughgoing or extreme: a radical change in company policy.
3. favoring drastic political, economic, or social reforms.
4. existing inherently in a thing or person: radical defects of character.
5. Math.
a. pertaining to or forming a root.
b. denoting or pertaining to the radical sign.
6. of or pertaining to the root of a word.
7. Bot. of or arising from the root or the base of the stem.
8. Slang. great; marvelous; wonderful.
n.
9. a person who holds or follows strong convictions or extreme principles; extremist.
10. a person who advocates fundamental political, economic, and social reforms by direct and often uncompromising methods.
11. Math.
a. a quantity expressed as a root of another quantity.
12. Chem.
[1350–1400; Middle English < Late Latin rādīcālis having roots < Latin rādīc- (s. of rādīx) root1]

rad·i·cal

(răd′ĭ-kəl)
1. A root, such as √2, especially as indicated by a radical sign (√).
2. A group of atoms that behaves as a unit in chemical reactions and is often not stable except as part of a molecule. The hydroxyl, ethyl, and phenyl radicals are examples. Radicals are unchanged by chemical reactions.

radical

A group of atoms forming part of many molecules. They are very reactive as they have an incomplete electron structure.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.radical - (chemistry) two or more atoms bound together as a single unit and forming part of a molecule
chemical science, chemistry - the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
building block, unit - a single undivided natural thing occurring in the composition of something else; "units of nucleic acids"
acyl, acyl group - any group or radical of the form RCO- where R is an organic group; "an example of the acyl group is the acetyl group"
alcohol group, alcohol radical - the chemical group -OH
aldehyde group, aldehyde radical - the chemical group -CHO
alkyl, alkyl group, alkyl radical - any of a series of univalent groups of the general formula CnH2n+1 derived from aliphatic hydrocarbons
allyl, allyl group, allyl radical - the univalent unsaturated organic radical C3H5; derived from propylene
amino, amino group - the radical -NH2
amyl - a hydrocarbon radical that occurs in many organic compounds
azido group, azido radical - the univalent group N3- derived from hydrazoic acid
azo group, azo radical - the bivalent group -N=N- united to two hydrocarbon groups
benzyl, benzyl group, benzyl radical - the univalent radical derived from toluene
benzoyl group, benzoyl radical - the univalent radical derived from benzoic acid
molecule - (physics and chemistry) the simplest structural unit of an element or compound
arsenic group, cacodyl group, cacodyl radical, cacodyl - the univalent group derived from arsine
carbonyl group - the bivalent radical CO
carboxyl, carboxyl group - the univalent radical -COOH; present in and characteristic of organic acids
chromophore - the chemical group that gives color to a molecule
cyanide group, cyanide radical, cyano group, cyano radical - the monovalent group -CN in a chemical compound
glyceryl - a trivalent radical derived from glycerol by removing the three hydroxyl radicals
hydrazo group, hydrazo radical - the bivalent group -HNNH- derived from hydrazine
hydroxyl, hydroxyl group, hydroxyl radical - the monovalent group -OH in such compounds as bases and some acids and alcohols
ketone group - a group having the characteristic properties of ketones
methylene, methylene group, methylene radical - the bivalent radical CH2 derived from methane
propyl, propyl group, propyl radical - the monovalent organic group C3H7- obtained from propane
butyl - a hydrocarbon radical (C4H9)
nitro group - the group -NO3
nitrite - the radical -NO2 or any compound containing it (such as a salt or ester of nitrous acid)
uranyl, uranyl group, uranyl radical - the bivalent radical UO2 which forms salts with acids
vinyl, vinyl group, vinyl radical - a univalent chemical radical derived from ethylene
2.radical - 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"
atom - (physics and chemistry) the smallest component of an element having the chemical properties of the element
3.radical - a person who has radical ideas or opinions
individual, mortal, person, somebody, someone, soul - a human being; "there was too much for one person to do"
anarchist, syndicalist, nihilist - an advocate of anarchism
Bolshevik, bolshie, bolshy, Marxist, red - emotionally charged terms used to refer to extreme radicals or revolutionaries
extremist - a person who holds extreme views
leveler, leveller - a radical who advocates the abolition of social distinctions
revolutionary, revolutionist, subversive, subverter - a radical supporter of political or social revolution
terrorist - a radical who employs terror as a political weapon; usually organizes with other terrorists in small cells; often uses religion as a cover for terrorist activities
Trotskyist, Trotskyite, Trot - radicals who support Trotsky's theory that socialism must be established throughout the world by continuing revolution
Wobbly - a member of the Industrial Workers of the World
young Turk - a young radical who agitates for reform
4.radical - (mathematics) a quantity expressed as the root of another quantity
quantity, measure, amount - how much there is or how many there are of something that you can quantify
math, mathematics, maths - a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement
5.radical - a character conveying the lexical meaning of a logogram
grapheme, graphic symbol, character - a written symbol that is used to represent speech; "the Greek alphabet has 24 characters"
ideogram, ideograph - a graphic character that indicates the meaning of a thing without indicating the sounds used to say it; "Chinese characters are ideograms"
6.radical - (linguistics) the form of a word after all affixes are removed; "thematic vowels are part of the stem"
linguistics - the scientific study of language
descriptor, form, signifier, word form - the phonological or orthographic sound or appearance of a word that can be used to describe or identify something; "the inflected forms of a word can be represented by a stem and a list of inflections to be attached"
Adj.1.radical - (used of opinions and actions) far beyond the normradical - (used of opinions and actions) far beyond the norm; "extremist political views"; "radical opinions on education"; "an ultra conservative"
immoderate - beyond reasonable limits; "immoderate laughter"; "immoderate spending"
2.radical - markedly new or introducing radical change; "a revolutionary discovery"; "radical political views"
new - not of long duration; having just (or relatively recently) come into being or been made or acquired or discovered; "a new law"; "new cars"; "a new comet"; "a new friend"; "a new year"; "the New World"
3.radical - arising from or going to the root or source; "a radical flaw in the plan"
basic - pertaining to or constituting a base or basis; "a basic fact"; "the basic ingredients"; "basic changes in public opinion occur because of changes in priorities"
4.radical - of or relating to or constituting a linguistic root; "a radical verb form"
linguistics - the scientific study of language
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; "basal placentation"; "radical leaves"
phytology, botany - the branch of biology that studies plants
cauline - especially of leaves; growing on a stem especially on the upper part of a stem; "cauline leaves"

radical

noun
1. extremist, revolutionary, militant, reformer, fanatic, left-winger, zealot, revisionist a former left-wing radical who was involved with the civil rights movement
extremist conservative, moderate, reactionary
Quotations
"A radical is a man with both feet firmly planted in the air" [Franklin D. Roosevelt radio broadcast]

radical

adjective
1. Arising from or going to the root or source:
2. Holding especially political views that deviate drastically and fundamentally from conventional or traditional beliefs:
Slang: far-out.
noun
One who holds extreme views or advocates extreme measures:
Translations
أساسيشامِل، جَذْريشَخْص راديكالي: مُتَطَرِّفمُتَطَرِّف
extrémníradikálradikálnízákladnízásadní
ekstremistgennemgribendegrundlæggenderadikalyderliggående
juurimullistavaperusperusteellinenradikaali
gyökeresradikális
djúptækur, róttækurgrundvallar-róttæklingurróttækur
部首
radikalas
būtiskskrasspamatīgs
extrémnyzásadný

radical

[ˈrædɪkəl]
A. ADJ
1. (Pol) [idea, organization] → radical; [person] → radical, de ideas radicales
she's very radicales muy radicales de or tiene ideas muy radicales
a radical feministuna feminista radical
2. (= extreme, major) [change, measures, surgery, reduction] → radical; [advance] → innovador
B. N (Pol) → radical mf (Bot, Chem, Ling, Math) → radical m

radical

[ˈrædɪkəl]
adj
[change, reform, overhaul] → radical(e)
[plan, proposal, concept, measure, idea] → radical(e)
[politician, party, wing, group, feminist] → radical(e)
[surgery] → radical(e)
(US) (= excellent) → d'enfer
n
(= person) → radical(e) m/f
(CHEMISTRY) (also free radical) → radical m libre

radical

adj
(= basic)fundamental, Grund-; difference, errorfundamental; (= extreme) change, reformradikal, grundlegend; rethinking, re-examinationtotal; measureseinschneidend, radikal; reductionradikal, fundamental, rigoros
(Pol) person, organization, idearadikal; attituderadikal, rigoros; to effect a radical cureeine Radikalkur machen; radical surgeryRadikalchirurgie f
(Math) → Wurzel-; a radical expressioneine Wurzel
(Bot) leavesbodenständig
n (Pol) → Radikale(r) mf; (Math, Gram) → Wurzel f; (in Chinese) → Radikal m; (Chem) → Radikal nt

radical

:
radical fundamentalist
adjradikalfundamentalistisch
radical Islamic
adjradikalislamisch

radical

[ˈrædɪkl]
1. adjradicale
2. n
a. (person) → radicale m/f
b. (Math, Chem) → radicale m

radical

(ˈrӕdikəl) adjective
1. relating to the basic nature of something. radical faults in the design.
2. thorough; complete. radical changes.
3. wanting or involving great or extreme political, social or economic changes.
noun
a person who wants radical political changes.
ˈradically adverb

radical

adj radical
References in classic literature ?
It seemed to them that the five millionaires of Devil's Ford, in their radical simplicity and thoroughness, were perhaps nearer the type of true gentlemanhood than these citizens who imitated a civilization they were unable yet to reach.
But they precisely agree in all their grand features; nor has there yet been presented a single determinate fact upon which to ground a radical distinction.
We shall have the sham reformers self-stultified and self-convicted; we shall have the radical Democracy left without a lie with which to cover its nakedness
Now what a radical reversal of things this was; what a jumbling together of extravagant incongruities; what a fantastic conjunction of opposites and irreconcilables -- the home of the bogus miracle become the home of a real one, the den of a mediaeval hermit turned into a telephone office!
There was still no result; so I examined these instruments and discovered that they possessed radical blemishes: the barometer had no hand but the brass pointer and the ball of the thermometer was stuffed with tin-foil.
For as much as a week after this, Tom imagined that his character had undergone a pretty radical change.
Even in our own days, when morals are better understood, an execution, a bruising match, a riot, or a meeting of radical reformers, collects, at considerable hazard to themselves, immense crowds of spectators, otherwise little interested, except to see how matters are to be conducted, or whether the heroes of the day are, in the heroic language of insurgent tailors, flints or dunghills.
Next to her sat, on her right, Sir Thomas Burdon, a Radical member of Parliament, who followed his leader in public life and in private life followed the best cooks, dining with the Tories and thinking with the Liberals, in accordance with a wise and well-known rule.
The chief thing I have to do is to attend at his dinners and suppers and allow him to eat what appears to me to be fit for him, and keep from him what I think will do him harm and be injurious to his stomach; and therefore I ordered that plate of fruit to be removed as being too moist, and that other dish I ordered to he removed as being too hot and containing many spices that stimulate thirst; for he who drinks much kills and consumes the radical moisture wherein life consists.
The great and radical vice in the construction of the existing Confederation is in the principle of LEGISLATION for STATES or GOVERNMENTS, in their CORPORATE or COLLECTIVE CAPACITIES, and as contradistinguished from the INDIVIDUALS of which they consist.
It is observable that among the numerous objections and amendments suggested by the several States, when these articles were submitted for their ratification, not one is found which alludes to the great and radical error which on actual trial has discovered itself.
He had some vague Radical opinions and some fleeting infidelities, which he would now and again set forth and emphasise with tottering slaps upon the table.