say it: pree-hi-STAW-rik
prehistoric is an adjective meaning "belonging to or existing in times before recorded history". It carries 3 recorded senses.
belonging to or existing in times before recorded history
“prehistoric settlements”
“prehistoric peoples”
of or relating to times before written history
“prehistoric archeology”
no longer fashionable
“my mother has these prehistoric ideas about proper clothes”
colloquialism
Definitions, synonyms and semantic relations for prehistoric come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.