Source : Webster's Revised Unabridged Dictionary (1913)

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}.]