Word Source - www.word.sc/radical - Dictionary definition for radical

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radical

adjective

(used of opinions and actions) far beyond the norm; "extremist political views"; "radical opinions on education"; "an ultra conservative"
Synonyms: extremist, ultra Similar: immoderate
markedly new or introducing radical change; "a revolutionary discovery"; "radical political views"
Synonyms: revolutionary Similar: new
arising from or going to the root; "a radical flaw in the plan"
Similar: basic
of or relating to or constituting a linguistic root; "a radical verb form"
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"
Synonyms: basal Antonyms: cauline

noun

(chemistry) two or more atoms bound together as a single unit and forming part of a molecule
Synonyms: chemical group, group
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 part
Synonyms: free radical
a person who has radical ideas or opinions
a character conveying the lexical meaning of a logogram
a sign placed in front of an expression to denote that a root is to be extracted
Synonyms: radical sign
(linguistics) the form of a word after all affixes are removed; "thematic vowels are part of the stem"
Synonyms: base, root, root word, stem, theme