Prehistoric

google

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mid 19th century: from French préhistorique (see pre-, historic).

wiktionary

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From pre-(“ before”) +‎ historic, q.v., similar to slightly earlier ante-historic.

etymonline

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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.