radical

Sense 1 noun

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

Sense 2 adjective

(used of opinions and actions) far beyond the norm

extremist political views

Sense 3 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

Sense 4 adjective

markedly new or introducing radical change

a revolutionary discovery

Sense 5 noun

a person who has radical ideas or opinions

Sense 6 adjective

arising from or going to the root or source

a radical flaw in the plan

Sense 7 noun

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

Sense 8 adjective

of or relating to or constituting a linguistic root

a radical verb form

Sense 9 noun

a character conveying the lexical meaning of a logogram

Sense 10 adjective

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

Sense 11 noun

(linguistics) the form of a word after all affixes are removed

thematic vowels are part of the stem