/ Dictionary / Index G great-grandchild: Meaning and Definition of Find definitions for: great-grand•child Pronunciation: (grāt"gran'chīld"), [key] — pl. -children. a grandchild of one's son or daughter. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: great-grandchild (Thesaurus) great-grandaunt great-granddaughter Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language