olefiant gas

[oh-luh-fahy-uh nt, oh-lee-fee-, oh-lef-ee-]

noun

ethylene(def 2).

Origin of olefiant gas

1800–10; part translation of French gaz oléfiant, equivalent to olé- (< Latin oleum oil) + -fiant, present participle of -fier -fy; see -ant

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018