Etymology
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prehistoric (adj.)

also pre-historic, "of or pertaining to times before recorded history, existing in or relating to time antecedent to the beginning of recorded history," 1851, perhaps modeled on French préhistorique; see pre- + historic. Related: Prehistorical.

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Definitions of prehistoric

prehistoric (adj.)
belonging to or existing in times before recorded history;
prehistoric settlements
prehistoric peoples
Synonyms: prehistorical
prehistoric (adj.)
of or relating to times before written history;
prehistoric archeology
prehistoric (adj.)
no longer fashionable;
my mother has these prehistoric ideas about proper clothes
From wordnet.princeton.edu