VOLATILE OIL'S
\vˈɒlɐtˌa͡ɪl ˈɔ͡ɪlz], \vˈɒlɐtˌaɪl ˈɔɪlz], \v_ˈɒ_l_ɐ_t_ˌaɪ_l ˈɔɪ_l_z]\
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Various odorous oily products of compound distillation from vegetable substances, insoluble or but sparingly soluble in water, more soluble in alcohol and in ether. They are inflammable, tend to become resinous in the air, and usually have an agreeable odor.
By Smith Ely Jelliffe