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n. [ Crotonic + acet-ylene. ] (Chem.) A colorless, volatile, pungent liquid, C4H6, produced artificially, and regarded as an unsaturated hydrocarbon of the acetylene series, and analogous to crotonic acid. [ 1913 Webster ]

n. [ Nonane + ethylene. ] (Chem.) Any one of a series of metameric, unsaturated hydrocarbons C9H18 of the ethylene series. [ 1913 Webster ]

a. (Chem.) Of, pertaining to, related to, or designating, nonylene or its compounds; as, nonylenic acid. [ 1913 Webster ]