HYPOGAEAN

\hˌa͡ɪpə͡ʊɡˈi͡ən], \hˌa‍ɪpə‍ʊɡˈi‍ən], \h_ˌaɪ_p_əʊ_ɡ_ˈiə_n]\
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1914 - Nuttall's Standard dictionary of the English language
By Nuttall, P.Austin.