PREHISTORICAL

\pɹˌiːhɪstˈɒɹɪkə͡l], \pɹˌiːhɪstˈɒɹɪkə‍l], \p_ɹ_ˌiː_h_ɪ_s_t_ˈɒ_ɹ_ɪ_k_əl]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd