/ Dictionary / Index P prehistoric: Meaning and Definition of Find definitions for: pre•his•tor•ic Pronunciation: (prē"hi-stôr'ik, -stor'-, prē"i-), [key] — adj. of or pertaining to the time or a period prior to recorded history: The dinosaur is a prehistoric beast. outdated; passé: My mom has these prehistoric ideas about proper dress. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: prehistoric (Thesaurus) prehension prehistory Related Content Daily Word Quiz: ephemeral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language