/ Dictionary / Index R radical axis: Meaning and Definition of Find definitions for: rad'ical ax'is Pronunciation: [key] ? Geom. Geom. the line such that tangents drawn from any point of the line to two given circles are equal in length. Random House Unabridged Dictionary, Copyright 1997, by Random House, Inc., on Infoplease. radical radical chic Related Content Daily Word Quiz: abscond Analogy of the Day: Today?s Analogy Spelling Bee: Today?s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language