/ Dictionary / Index P protohistory: Meaning and Definition of Find definitions for: pro•to•his•to•ry Pronunciation: (prō"tō-his'tu-rē, -his'trē), [key] — pl. -ries. a branch of study concerned with the transition period between prehistory and the earliest recorded history. the period in a culture immediately before its recorded history begins. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: protohistory (Thesaurus) Proto-Germanic protohuman 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