THERMO-

\θˈɜːmə͡ʊ], \θˈɜːmə‍ʊ], \θ_ˈɜː_m_əʊ]\
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1919 - The Concise Standard Dictionary of the English Language
By James Champlin Fernald
 
1916 - Appleton's medical dictionary
By Smith Ely Jelliffe