elæo-comb. form of Gr. ἔλαιο-ν oil (properly olive-oil), used in technical, chiefly chemical, words, as elæocerate|ˌɛliːəʊˈsɪəreɪt|[cf. cerate], same as cerate. elæomargaric (acid) |ˌɛliːəʊmɑːˈgærɪk|, a.[cf. margaric], an acid found in the oil extracted from the seeds of some species of Elæococca. elæometer|ɛliːˈɒmɪtə(r)|; also elaio-[see meter], ‘an instrument for determining the specific weight of oils, and so their purity’ (Syd. Soc.Lex.). elæopten(e|ɛliːˈɒptiːn|, also ela-; [Gr. πτην-ός winged, volatile: cf.Fr.éléoptène], the liquid part of a volatile oil, as distinguished from the crystallizable portion called ‘stearoptene’ or ‘camphor’. elæostearic (acid) |ˌɛliːəʊstiːˈærɪk|, a.[cf. stearic], a solid acid separated by the action of alcohol upon the solid fat obtained from the oil of Elæococca.