Crotonylene \Cro*ton"y*lene\ (kr?-t?n"?-l?n), 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]