HYDRO-AEROPLANE

\hˈa͡ɪdɹə͡ʊˈe͡əɹəplˌe͡ɪn], \hˈa‍ɪdɹə‍ʊˈe‍əɹəplˌe‍ɪn], \h_ˈaɪ_d_ɹ_əʊ_ˈeə_ɹ_ə_p_l_ˌeɪ_n]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.
 
1919 - The concise Oxford dictionary of current English
By Sir Augustus Henry