/ Dictionary / Index G greyback: Meaning and Definition of Find definitions for: grey•back Pronunciation: (grā'bak"), [key] — n. grayback. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: greyback (Thesaurus) grey greybeard Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language