/ Dictionary / Index G greatest common divisor: Meaning and Definition of Find definitions for: great'est com'mon divi'sor Pronunciation: [key] the largest number that is a common divisor of a given set of numbers. Abbr.: G.C.D. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. greater yellowlegs greatest-integer function Related Content Daily Word Quiz: effervescent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language