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

[ Syn: basal ]

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

[ Syn: group , chemical group ]

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

[ Syn: free radical ]

a person who has radical ideas or opinions

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

a character conveying the lexical meaning of a logogram

(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 ]

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

[ Syn: extremist , ultra ]

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

[ Syn: revolutionary ]

arising from or going to the root or source; a radical flaw in the plan'