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radical

noun: (chemistry) two or more atoms bound together as a single unit and forming part of a molecule

noun: 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"

noun: a person who has radical ideas or opinions

noun: (mathematics) a quantity expressed as the root of another quantity

noun: a character conveying the lexical meaning of a logogram

noun: (linguistics) the form of a word after all affixes are removed; "thematic vowels are part of the stem"

adj: (used of opinions and actions) far beyond the norm; "extremist political views"; "radical opinions on education"; "an ultra conservative"

adj: markedly new or introducing radical change; "a revolutionary discovery"; "radical political views"

adj: arising from or going to the root or source; "a radical flaw in the plan"

adj: of or relating to or constituting a linguistic root; "a radical verb form"

adj: 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"