Definitions

1. noun

A bivalent group, particularly one containing an sp2-hybridized carbon atom that is bonded to two alkyl groups.

“The organic chemist carefully added the alkylidene to the reaction mixture to initiate the polymerization process.”

2. adjective

Characterized by or containing an alkylidene group.

“The alkylidene-substituted compound exhibited unique reactivity in the presence of a strong base.”