/ Dictionary / Index G great-grandmother: Meaning and Definition of Find definitions for: great-grand•moth•er Pronunciation: (grāt"gran'mu"ur, -grand'-, -gram'-), [key] — n. a grandmother of one's father or mother. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: great-grandmother (Thesaurus) great-grandfather great-grandnephew 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