| alkene | <chemistry> An organic molecule containing carbon and hydrogen atoms in straight or branched chains, where at least one carbon-carbon bond is a double bond. One of three major classes of aliphatic hydrocarbons. (13 Nov 1997) |
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| alkene monooxygenase | <enzyme> Multicomponent, NADH or NADPH-dependent enzyme from mycobacterium; similar to EC 1.14.13.25 but only converts alkenes to the corresponding epoxides Registry number: EC 1.14.13.- (26 Jun 1999) |
| alkenes | Unsaturated hydrocarbons of the type cn-h2n, indicated by the suffix -ene. (12 Dec 1998) |