radical

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 (sense 8).

[Middle English, of a root, from Late Latin rādīcālis, having roots, from Latin rādīx, rādīc-, root.]

radically rad'i·cal·ly adv.
radicalness rad'i·cal·ness n.

A group of atoms, either in a compound or existing alone. See free radical; functional group.

External Links:

• http://www.acdlabs.com/iupac/nomenclature/93/r93_569.htm -- Information about IUPAC nomenclature
• http://www.acdlabs.com/iupac/nomenclature/79/r79_1036.htm -- List of radical names

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adjective

1. Arising from or going to the root or source: basal, basic, foundational, fundamental, original, primary, underlying. See surface/depth.
2. Holding especially political views that deviate drastically and fundamentally from conventional or traditional beliefs: extreme, extremist, fanatic, fanatical, rabid, revolutionary, ultra. Slang far-out. See concern/unconcern, edge/center, politics.

noun

One who holds extreme views or advocates extreme measures: extremist, fanatic, revolutionary, revolutionist, ultra, zealot. See edge/center, concern/unconcern, politics.

adj

Definition: extreme, revolutionary in belief
Antonyms: conservative, moderate

adj

Definition: fundamental, basic
Antonyms: extrinsic, minor, nonessential, superficial

n

Definition: person who holds revolutionary beliefs
Antonyms: conservative, moderate

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1. directed to the cause; going to the root or source of a morbid process.
2. a group of atoms that enters into and goes out of chemical combination without change and that forms one of the fundamental constituents of a molecule.

• free r. — a radical, extremely reactive, and having a very short half-life (10⁻⁵ s or less in an aqueous solution), which carries an unpaired electron.

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Dansk (Danish)
adj. - radikal, gennemgribende, fundamental, ekstrem, rod
n. - radikal, ekstremist, yderligtgående

idioms:

• radical chic    kystbanesocialist
• radical sign    rodtegn

Nederlands (Dutch)
radicaal, ingrijpend, wezenlijk, wortel-, betreffende de stam van woorden, grond- (muziek), te gek, wortelteken, stam van een woord, basisprincipe

Français (French)
adj. - (gén, Pol) radical
n. - (Pol) radical, (Chim) radicaux libres

idioms:

• radical chic    affectation très en vogue des idées des radicaux de gauche, style des radicaux de gauche
• radical sign    symbole du radical

Deutsch (German)
n. - Radikaler, Wurzel(zeichen), Radikal
adj. - radikal, grundlegend, durchgreifend

idioms:

• radical chic    Anhängerschaft von radikal linken Ideen
• radical sign    (Math.) Wurzelzeichen

Ελληνική (Greek)
n. - ριζοσπάστης
adj. - ριζικός, ριζοσπαστικός

idioms:

• radical chic    αριστερισμός της μόδας
• radical sign    (μαθημ.) ριζικό σύμβολο

Italiano (Italian)
radice, radicale, estremista, segno della radice

idioms:

• radical chic    radicale all'acqua di rose
• radical sign    segno di radice

Português (Portuguese)
n. - radical
adj. - radical

idioms:

• radical chic    radical chique (gír.)
• radical sign    radical (Mat.)

Русский (Russian)
радикал, корень, радикальный, корневой

idioms:

• radical chic    придерживаться модных левых взглядов
• radical sign    знак корня

Español (Spanish)
adj. - radical, fundamental, extremista
n. - raíz, fundamento

idioms:

• radical chic    forma de vida y vestimenta de los izquierdistas radicales
• radical sign    signo (símbolo) radical

Svenska (Swedish)
n. - radikal (pol), (språkv) rotord
adj. - grundlig, ursprunglig, (pol) radikal

中文（简体）(Chinese (Simplified))
根本的, 基本的, 原本的, 与生俱来的, 彻底的, 极端的, 过激的, 根部, 基本原理, 基础, 激进分子

idioms:

• radical chic    与激进派交往的时尚
• radical sign    根号

中文（繁體）(Chinese (Traditional))
adj. - 根本的, 基本的, 原本的, 與生俱來的, 徹底的, 極端的, 過激的
n. - 根部, 基本原理, 基礎, 激進分子

idioms:

• radical chic    與激進派交往的時尚
• radical sign    根號

한국어 (Korean)
adj. - 근본적인, 급진적인, 기초의
n. - 급진 당원, 과격주의자, 어근

日本語 (Japanese)
adj. - 根本的な, 徹底的な, 過激な
n. - 急進的な人, 急進主義者, 基, 過激論者, 根号

idioms:

• radical chic    過激派好み
• radical sign    根号

العربيه (Arabic)
‏(الاسم) أساس, , جذر (صفه) متطرف, جذري, جوهري‏

עברית (Hebrew)
adj. - ‮קיצוני, שורשי, רדיקל, רדיקלי, תובע תיקונים יסודיים, מצוין, בולט, מצטיין (מדוברת)‬
n. - ‮שורש, קבוצת אטומים, שורשון, שורש של מספר, חומר כימי שאינו משתנה בעת שינויים בתרכובת‬

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