rad·i·cal (r d  -k l)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: radical opinions on education. 3. Favoring or effecting fundamental or revolutionary changes in current practices, conditions, or institutions: radical political views. 4. Linguistics Of or being a root: a radical form. 5. Botany Arising from the root or its crown: radical leaves. 6. 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 at least one unpaired electron. 4. Linguistics See root1. [Middle English, of a root, from Late Latin r  d clis, having roots, from Latin rdx, rdc-, root; see wrd- 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. (Life Sciences & Allied Applications / 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
1. (Government, Politics & Diplomacy) a person who favours extreme or fundamental change in existing institutions or in political, social, or economic conditions
2. (Mathematics) Maths a root of a number or quantity, such as 3√5, √x
3. (Chemistry) Chem
a. short for free radical
b. another name for group [10]
4. (Linguistics) Linguistics another word for root1 [9]
5. (Linguistics) (in logographic writing systems such as that used for Chinese) a part of a character conveying lexical meaning
[from Late Latin rādīcālis having roots, from Latin rādix a root]
radicalness n
| radical (rd-kl) 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. |
ThesaurusLegend: Synonyms Related Words Antonyms
| 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" |
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
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]
Translations
radical [ˈrædɪkəl]
radical [ˈrædɪkəl]
radical
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
adj radical [ˈrӕdikəl]
1 relating to the basic nature of something radical faults in the design. wesenlik أساسي коренен základní grundlæggende fundamental ριζικός, βασικός radical, fundamental põhimõtteline اصلی perinpohjainen fondamental יְסוֹדִי आधारिक radikalan,temeljan gyökeres mendasar grundvallar- radicale 根本的な 근원적인 esminis būtisks radikal radiator grunnleggende podstawowy, zasadniczy radical esenţial коренной základný bistven radikalan grundläggande, fundamental โดยรากฐาน temel, asıl 根本的 корінний; основний بنیادی cơ bản 基本的
2 thorough; complete radical changes. grondig شامِل، جَذْري цялостен zásadní gennemgribende drastisch ριζικός, ολοκληρωμένος radical põhjalik اساسس؛ بنیادی radikaali radical יְסוֹדִי आमूल परिर्वतनवादी, उग्र उन्मूलनवादी korjenite, radikalne alapvető menyeluruh djúptækur, róttækur radicale 徹底した 완전한 radikalus radikāls; pamatīgs perubahan radikal radicaal dyptgående, radikal gruntowny radical radical полный zásadný korenit radikalan genomgripande, radikal ทั่วถึง köklü, radikal 徹底的 фундаментальний, повний مکمل triệt để 根本的
3 wanting or involving great or extreme political, social or economic changes. radikaal مُتَطَرِّف радикален radikální, extrémní radikal; yderliggående radikal ριζοσπαστικός radical radikaalne طرفدار اصلاحات اساسی vallankumouksellinen radical קִיצוֹנִי उग्र, आत्यनिक radikalizirati radikális radikal róttækur radicale 急進的な 급진적인 radikalus, griežtas radikāls; krass bersifat radikal radicaal radikal radykalny radical radical радикальный radikálny, extrémny radikalen radikalan radikal ซึ่งเปลี่ยนแปลงครั้งใหญ่ radikal, köktenci 激進的 радикальний, лівий انتہا پسند cực đoan; cấp tiến 激进的
n
a person who wants radical political changes. radikalis شَخْص راديكالي: مُتَطَرِّف радикал radikál ekstremist der/die Radikale ριζοσπάστης radical radikaal فراطی؛ تندرو vallankumouksellinen radical/-ale רָדִיקָל आमूल परिवर्तनवादी व्यक्ति radikalist radikális (politikus) orang radikal róttæklingur radicale 急進派 급진주의자 radikalas radikālis golongan radikal radicaal radikal, venstreorientert person radykał radical radical(ist) радикал radikál radikalec radikalna osoba radikal คนหัวรุนแรง radikal kimse, köktenci 激進份子 радикал انقلابی người theo quan điểm cực đoan 激进分子
adv radically
radikaal بِصورَةٍ مُتَطَرِّفَه радикално radikálně radikalt; yderliggående radikal ριζικά, ριζοσπαστικά radicalmente radikaalselt radikaalisti radicalement בְּאוֹפֶן יְסוֹדִי मूलत:, आमूलता से, उग्रता से radikalno, korjenito gyökeresen secara mengakar á róttækan hátt radicalmente 根本的に 근본적으로, 철저히, 급진적으로 radikaliai, iš esmės radikāli, būtiski dengan radikal radicaal grunnleggende, radikalt radykalnie, zasadniczo radicalmente (în mod) radical радикально radikálne korenito radikalno radikalt โดยมูลฐาน kök(ün)den, temel(in)den 根本上 радикально اساسی طور پر một cách triệt để 根本上
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