ETHEREAL OIL

\iːθˈi͡əɹɪə͡l ˈɔ͡ɪl], \iːθˈi‍əɹɪə‍l ˈɔ‍ɪl], \iː_θ_ˈiə_ɹ_ɪ__əl ˈɔɪ_l]\
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1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland
 
1916 - Appleton's medical dictionary
By Smith Ely Jelliffe