radical

1. (chemistry) two or more atoms bound together as a single unit and forming part of a molecule (synset 114645624)
   referred to in: chemical science, chemistry - the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
   is a type of: building block, unit - a single undivided natural thing occurring in the composition of something else
   subtypes:

   • acyl, acyl group - any group or radical of the form RCO- where R is an organic 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
   • arsenic group, cacodyl, cacodyl group, cacodyl radical - 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
   is a part of: molecule - (physics and chemistry) the simplest structural unit of an element or compound
   same as: chemical group, group
2. 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 (synset 114898347)
   "in the body free radicals are high-energy particles that ricochet wildly and damage cells"
   is a type of: atom - (physics and chemistry) the smallest component of an element having the chemical properties of the element
   same as: free radical
3. A person who has radical ideas or opinions (synset 110523045)
   is a type of: individual, mortal, person, somebody, someone, soul - a human being
   subtypes:

   • anarchist, nihilist, syndicalist - 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
   • trot, trotskyist, trotskyite - 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. (mathematics) a quantity expressed as the root of another quantity (synset 113753670)
   referred to in: math, mathematics, maths - a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement
   is a type of: amount, measure, quantity - how much there is or how many there are of something that you can quantify
5. A character conveying the lexical meaning of a logogram (synset 106854209)
   is a type of: character, graph, grapheme, graphic symbol - a written symbol that is used to represent speech
   is a part of: ideogram, ideograph - a graphic character that indicates the meaning of a thing without indicating the sounds used to say it
6. (linguistics) the form of a word after all affixes are removed (synset 106311183)
   "thematic vowels are part of the stem"
   referred to in: linguistics - the scientific study of language
   is a type of: descriptor, form, signifier, word form - the phonological or orthographic sound or appearance of a word that can be used to describe or identify something
   same as: base, root, root word, stem, theme

1. (used of opinions and actions) far beyond the norm (synset 301539365)
   "extremist political views"; "radical opinions on education"; "an ultra conservative"
   similar to: immoderate - beyond reasonable limits
   same as: extremist, ultra
2. Markedly new or introducing radical change (synset 301647099)
   "a revolutionary discovery"; "radical political views"
   similar to: new - not of long duration; having just (or relatively recently) come into being or been made or acquired or discovered
   same as: revolutionary
3. Arising from or going to the root or source (synset 301862742)
   "a radical flaw in the plan"
   similar to: basic - pertaining to or constituting a base or basis
4. Of or relating to or constituting a linguistic root (synset 302847364)
   "a radical verb form"
   referred to in: linguistics - the scientific study of language
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 (synset 300319565)
   "basal placentation"; "radical leaves"
   referred to in: botany, phytology - the branch of biology that studies plants
   same as: basal

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