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radical US English

(Especially of change or action) relating to or affecting the fundamental nature of something; far-reaching or thorough

radical US Thesaurus

radical reform

acid radical US English

A radical formed by the removal of hydrogen ions from an acid

free radical US English

An uncharged molecule (typically highly reactive and short-lived) having an unpaired valence electron

radical chic US English

The fashionable affectation of radical left-wing views

radical sign US English

The sign √, which indicates the square root of the number following (or a higher root indicated by a preceding superscript numeral)