Definition of prehistoric adjective from the Oxford Advanced American Dictionary

 

prehistoric

 adjective
adjective
NAmE//ˌprihɪˈstɔrɪk//
 
, NAmE//ˌprihɪˈstɑrɪk//
 
 
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connected with the time in history before information was written down in prehistoric times prehistoric man/remains/animals/burial sites
See the Oxford Advanced Learner's Dictionary entry: prehistoric