radical
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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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.
b. free radical.
[1350–1400; Middle English < Late Latin rādīcālis having roots < Latin rādīc- (s. of rādīx) root1]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
radical
A group of atoms forming part of many molecules. They are very reactive as they have an incomplete electron structure.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited
ThesaurusAntonymsRelated WordsSynonymsLegend:
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Noun | 1. | 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 benzoyl group, benzoyl radical - the univalent radical derived from benzoic acid molecule - (physics and chemistry) the simplest structural unit of an element or compound 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 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) |
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" Bolshevik, bolshie, bolshy, Marxist, red - emotionally charged terms used to refer to extreme radicals or revolutionaries extremist - a person who holds extreme views 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" | |
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 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" cauline - especially of leaves; growing on a stem especially on the upper part of a stem; "cauline leaves" |
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
radical
adjective
1. extreme, complete, entire, sweeping, violent, severe, extensive, wide-ranging, excessive, thorough, drastic, rigorous, far-reaching, draconian periods of radical change
2. revolutionary, reforming, extreme, militant, progressive, left-wing, extremist, reformist, fanatical political tension between radical and conservative politicians
3. fundamental, natural, basic, essential, native, constitutional, organic, profound, innate, deep-seated, thoroughgoing, hard-wired the radical differences between them
fundamental minor, token, trivial, superficial, insignificant
fundamental minor, token, trivial, superficial, insignificant
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
extremist conservative, moderate, reactionary
Quotations
"A radical is a man with both feet firmly planted in the air" [Franklin D. Roosevelt radio broadcast]
"A radical is a man with both feet firmly planted in the air" [Franklin D. Roosevelt radio broadcast]
Collins Thesaurus of the English Language – Complete and Unabridged 2nd Edition. 2002 © HarperCollins Publishers 1995, 2002
radical
adjective1. Arising from or going to the root or source:
One who holds extreme views or advocates extreme measures:
The American Heritage® Roget's Thesaurus. Copyright © 2013, 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Translations
أساسيشامِل، جَذْريشَخْص راديكالي: مُتَطَرِّفمُتَطَرِّف
extrémníradikálradikálnízákladnízásadní
ekstremistgennemgribendegrundlæggenderadikalyderliggående
juurimullistavaperusperusteellinenradikaali
gyökeresradikális
djúptækur, róttækurgrundvallar-róttæklingurróttækur
radicaleradicalicofondamentale
部首
radikalas
būtiskskrasspamatīgs
extrémnyzásadný
radical
[ˈrædɪkəl]Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005
radical
[ˈrædɪkəl]Collins English/French Electronic Resource. © HarperCollins Publishers 2005
radical
adj
(= basic) → fundamental, Grund-; difference, error → fundamental; (= extreme) change, reform → radikal, grundlegend; rethinking, re-examination → total; measures → einschneidend, radikal; reduction → radikal, fundamental, rigoros
(Pol) person, organization, idea → radikal; attitude → radikal, rigoros; to effect a radical cure → eine Radikalkur machen; radical surgery → Radikalchirurgie f
(Bot) leaves → bodenständig
radical
:radical fundamentalist
adj → radikalfundamentalistisch
radical Islamic
adj → radikalislamisch
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995
radical
(ˈrӕdikəl) adjective1. 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 adverbKernerman English Multilingual Dictionary © 2006-2013 K Dictionaries Ltd.
radical
adj radicalEnglish-Spanish/Spanish-English Medical Dictionary Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.