/ Dictionary / Index G Gigantopithecus*: Meaning and Definition of Find definitions for: Gi•gan•to•pi•the•cus Pronunciation: (jī-gan"tō-pi-thē'kus, -pith'i-kus, ji-), [key] — n. a genus of extinct ape of southern Asia existing during the Pliocene and Pleistocene epochs, known only from very large fossil jaws and teeth and believed to be perhaps the biggest hominoid that ever lived. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. gigantism gigaton 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