MICROCEPHALIC

\mˌa͡ɪkɹə͡ʊsɛfˈalɪk], \mˌa‍ɪkɹə‍ʊsɛfˈalɪk], \m_ˌaɪ_k_ɹ_əʊ_s_ɛ_f_ˈa_l_ɪ_k]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd
 
1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland