/ Dictionary / Index G grandnephew: Meaning and Definition of Find definitions for: grand•neph•ew Pronunciation: (gran'nef"y, -nev"y, grand'-), [key] — n. a son of one's nephew or niece. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: grandnephew (Thesaurus) Grand Mufti grandniece Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language