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Definition of radical
radical - 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; arising from or going to the root; of or relating to or constituting a linguistic root; (used of opinions and actions) far beyond the norm; markedly new or introducing radical change; noun a sign placed in front of an expression to denote that a root is to be extracted; a character conveying the lexical meaning of a logogram; a person who has radical ideas or opinions; (linguistics) the form of a word after all affixes are removed; (chemistry) two or more atoms bound together as a single unit and forming part of a molecule; 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.
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