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From The Collaborative International Dictionary of English v.0.48:
Elaeoptene \E`l[ae]*op"tene\, n. [Gr. ? olive oil, oil + ? winged, fleeting.] (Chem.) The more liquid or volatile portion of certain oily substance, as distinguished from stearoptene, the more solid parts. [Written also elaoptene.] [1913 Webster]