AskDefine | Define radical

Dictionary Definition

radical adj
1 (used of opinions and actions) far beyond the norm; "extremist political views"; "radical opinions on education"; "an ultra conservative" [syn: extremist, ultra]
2 markedly new or introducing radical change; "a revolutionary discovery"; "radical political views" [syn: revolutionary]
3 arising from or going to the root; "a radical flaw in the plan"
4 of or relating to or constituting a linguistic root; "a radical verb form"
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]

Noun

1 (chemistry) two or more atoms bound together as a single unit and forming part of a molecule [syn: group, chemical group]
2 an atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule than 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" [syn: free radical]
3 a person who has radical ideas or opinions
4 a character conveying the lexical meaning of a logogram
5 a sign placed in front of an expression to denote that a root is to be extracted [syn: radical sign]
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]

User Contributed Dictionary

English

Etymology

Latin radicalis.

Pronunciation

Extensive Definition

Radical (from Latin radicis, genitive of radix "root") can refer to many different things and concepts.

Mathematics

Chemistry

Linguistics

Society

Businesses and organizations

Music albums

Other

radical in Catalan: Radical
radical in German: Radikal
radical in Spanish: Radical
radical in French: Radical
radical in Ido: Radiko
radical in Italian: Radicale
radical in Dutch: Radicaal
radical in Japanese: ラジカル
radical in Norwegian: Radikal
radical in Portuguese: Radical
radical in Romanian: Radical
radical in Russian: Радикал
radical in Slovenian: Radikal
radical in Finnish: Radikaali
radical in Swedish: Radikal
radical in Chinese: 基

Synonyms, Antonyms and Related Words

Bolshevik, Bolshevist, Fabian, Gospel side, IC analysis, Jacobin, Kekule formula, Wobbly, ab ovo, aboriginal, absolute, accidence, acid, acidity, advanced, affix, affixation, agent, agitator, algorismic, algorithmic, aliquot, alkali, alkalinity, all-embracing, all-encompassing, all-inclusive, all-out, all-pervading, alloisomer, allomorph, anarchist, anarchistic, anarcho-syndicalist, anion, antacid, arrowhead, at the height, at the limit, atom, atomic cluster, basal, base, basement, basic, basilar, basis, bearing wall, bed, bedding, bedrock, beginning, benzene ring, biochemical, born, bottom, bound morpheme, branched chain, broad, broad-based, broad-minded, cantorial side, cardinal, cataclysmic, catastrophic, cation, central, chain, character, chemical, chemical element, chromoisomer, clean, clear, closed chain, commencement, communist, complete, compound, compound radical, comprehensive, conception, congenital, conjugation, constituent, constitutional, constitutive, consummate, copolymer, corrective, counterclockwise, crucial, cuneiform, cutting, cycle, decimal, declension, deep, deep-dyed, deep-seated, demotic character, derivation, determinative, difference of form, differential, digital, dimer, downright, drastic, dyad, dyed-in-the-wool, egregious, element, elemental, elementary, embryonic, emendatory, enclitic, entire, essential, even, exhaustive, exponential, extreme, extreme left-winger, extremist, extremistic, fanatic, fanatical, far out, figural, figurate, figurative, finite, floor, flooring, fond, footing, formative, foundation, foundational, fractional, free form, fundament, fundamental, furthest, generative, genesis, genetic, germinal, gradualistic, grammalogue, grass roots, greatest, ground, grounds, groundwork, gut, hardpan, head, heavy chemicals, heptad, heterocycle, hexad, hieratic symbol, hieroglyph, hieroglyphic, hieroglyphics, high polymer, hiragana, homocycle, homopolymer, hydracid, ideogram, ideograph, imaginary, immediate constituent analysis, immoderate, impair, impossible, in embryo, in ovo, inception, infinite, infix, infixation, inflection, inherent, inorganic chemical, insurgent, insurrectionary, insurrectionist, integral, intensive, intrinsic, ion, irrational, isomer, kana, katakana, larboard, lattice, left, left hand, left wing, left-hand, left-hand side, left-wing, left-wing extremist, left-winger, left-wingish, leftist, levorotatory, liberal, logarithmic, logogram, logograph, logometric, lunatic fringe, macromolecule, material, meliorist, melioristic, metamer, mild radical, mildly radical, militant, molecule, monad, monomer, morph, morpheme, morphemic analysis, morphemics, morphology, morphophonemics, most, natural, near, near side, negative, neutralizer, nigh, nihilist, nihilistic, nonacid, numeral, numerary, numerative, numeric, octad, odd, of the essence, ogham, omnibus, omnipresent, ordinal, organic, organic chemical, origin, original, origination, out-and-out, outright, oxyacid, pair, paradigm, parlor Bolshevik, parlor pink, pavement, pentad, perfect, pervasive, phonetic, phonetic symbol, pictogram, pictograph, pink, pinko, plain, plumb, polymer, port, port tack, portside, positive, possible, prefix, prefixation, pregnant, primal, primary, prime, primeval, primitive, primordial, principal, principle, pristine, proclitic, profound, progressionist, progressist, progressive, progressivist, protogenic, provenience, pseudoisomer, pure, rabid, radix, rational, reagent, rebel, reciprocal, red, reformational, reformative, reformatory, reformer, reformist, reformistic, regular, revisional, revisionist, revisory, revolutional, revolutionary, revolutionist, revulsionary, revulsive, ring, riprap, rise, rock bottom, root, rudiment, rudimentary, rune, sans-culotte, seat, secessionist, seminal, separatist, severe, sheer, shorthand, side chain, sill, simple radical, sinister, sinistral, sinistrocerebral, sinistrocular, sinistrogyrate, sinistrorse, solid ground, solid rock, source, space-lattice, stem, stereobate, stock, straight, straight chain, stylobate, submultiple, substantial, substantive, substratum, substruction, substructure, subversive, suffix, suffixation, sulfacid, surd, sweeping, syndicalist, taproot, terra firma, tetrad, theme, thorough, thoroughgoing, through-and-through, tolerant, too much, total, transcendental, transilient, triad, trimer, ubiquitous, ultra, ultra-ultra, ultraconservative, ultraist, ultraistic, unconditional, underbuilding, undercarriage, undergirding, underlying, underpinning, understruction, understructure, universal, unmitigated, unqualified, unreserved, unrestricted, utmost, utopian, utopist, utter, uttermost, veritable, verso, vital, way out, wedge, wholesale, wide, word letter, word-formation, wrong side, yippie, zealot
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