Webster's English Dictionary

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prehistoric

pre.his.tor.ic \.pre--is-'to.r-ik, -(.)his-, -'ta:r-\ \-i-k*l\ \-k(*-)le-\ 
   aj 1: of, relating to, or existing in times antedating written history  2: 
   of or relating to a language in a period of its development from which  
   contemporary records of its actual sounds and forms have not been preserved 
   - pre.his.tor.i.cal aj