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radical

adjective · noun

Words like radical

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MEANING & USAGE

Definitions & examples

01adjective

(used of opinions and actions) far beyond the norm

“extremist political views”

“radical opinions on education”

02adjective

markedly new or introducing radical change

“a revolutionary discovery”

“radical political views”

03adjective

arising from or going to the root or source

“a radical flaw in the plan”

04adjective

of or relating to or constituting a linguistic root

“a radical verb form”

7 more meanings

05adjective

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”

06noun

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

07noun

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”

08noun

a person who has radical ideas or opinions

09noun

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

10noun

a character conveying the lexical meaning of a logogram

11noun

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

“thematic vowels are part of the stem”

Meanings and examples from Open English WordNet 2025. About our sources ↗

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Expressions with “radical”

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Explore multiword dictionary entries containing this word. Each has its own meanings and related words.

azo radical free radical radical cell radical chic radical sign alkyl radical allyl radical azido radical