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olefiant gas

[oh-luh-fahy-uh nt, oh-lee-fee-, oh-lef-ee-]
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noun
  1. ethylene(def 2).
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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