- butadiene by WordNet
nounA gaseous hydrocarbon C4H6; used in making synthetic rubbers. .
- Crotonylene by Webster's
... n.) A colorless, volatile, pungent liquid, C4H6, produced artificially, and regarded as an unsaturated hydrocarbon of the acetylene series, and analogous to crotonic acid.
- Tetracid by Webster's
... a.) Capable of neutralizing four molecules of a monobasic acid; having four hydrogen atoms capable of replacement ba acids or acid atoms; -- said of certain bases; thus, erythrine, C4H6(OH)4, is a tetracid alcohol.