HYDROCEPHALOID

\hˈa͡ɪdɹə͡ʊsfˌalɔ͡ɪd], \hˈa‍ɪdɹə‍ʊsfˌalɔ‍ɪd], \h_ˈaɪ_d_ɹ_əʊ_s_f_ˌa_l_ɔɪ_d]\
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1900 - A dictionary of medicine and the allied sciences
By Alexander Duane
 
1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland