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The Collaborative International Dictionary
Eikosylene

Eikosylene \Ei*kos"y*lene\, n. [Gr. e'i`kosi twenty + acetylene.] (Chem.) A liquid hydrocarbon, C20H38, of the acetylene series, obtained from brown coal.

Wiktionary
eikosylene

n. (context chemistry archaic English) A liquid hydrocarbon, C20H38, of the acetylene series, obtained from lignite.