prehistoric definition
WordReference Random House Learner's Dictionary of American English Â© 2018 preâ¢hisâ¢torâ¢ic /ËprihÉªËstÉrÉªk, -ËstÉr-, ËpriÉª-/ USA pronunciation also Ëpreâ¢hisËtorâ¢iâ¢cal, adj. of or relating to the time before history: prehistoric cave paintings. WordReference Random House Unabridged Dictionary of American English Â© 2018 preâ¢hisâ¢torâ¢ic (prÄâ²hi stÃ´râ²ik, -storâ²-, prÄâ²i-), USA pronunciation adj. of or pertaining to the time or a period prior to recorded history: The dinosaur is a prehistoric beast. Slang Terms outdated; passÃ©: My mom has these prehistoric ideas about proper dress. Also, preâ²hisâ¢torâ²iâ¢cal. preâ²hisâ¢torâ²iâ¢calâ¢ly, adv.