/ Dictionary / Index P protohuman: Meaning and Definition of Find definitions for: pro•to•hu•man Pronunciation: (prō"tō-hy'mun or, often, -y'-), [key] — adj. of, pertaining to, or resembling extinct hominid populations that had some but not all the features of modern Homo sapiens. —n. a protohuman animal. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. protohistory Proto-Indo-European Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language