[pree-hi-stawr-ik, -stor-, pree-i-]
of or pertaining to the time or a period prior to recorded history: The dinosaur is a prehistoric beast.
Slang. outdated; passé: My mom has these prehistoric ideas about proper dress.
Also, prehistorical.

1850–55; pre- + historic

prehistorically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
prehistoric or prehistorical (ˌpriːhɪˈstɒrɪk)
of or relating to man's development before the appearance of the written word
prehistorical or prehistorical
prehis'torically or prehistorical

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1851, modeled on Fr. préhistorique, from pre- + history (q.v.). Prehistory is attested from 1871.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But popular appeal notwithstanding, the evolutionary history of this
  prehistoric beast has proved somewhat difficult to pin down.
Reminders of the metropolitan region's prehistoric past are obvious to those
  who know where to look.
There is a haunting prehistoric ritual still conditioned into every human
  being's reflexes.
They argue that mankind's prehistoric penchant for mammoth may have had a
  discernible effect on climate.
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