Crotonylene
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Cro`ton´y`lene
| n. | 1. | (Chem.) A colorless, volatile, pungent liquid, C4H6, produced artificially, and regarded as an unsaturated hydrocarbon of the acetylene series, and analogous to crotonic acid. |
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.