cu·mi·dine \ˈkyüməˌdēn, -_də̇n\noun (-s) Etymology: International Scientific Vocabulary cum- + -idine; originally formed as German kumidin : any of three isomeric liquid bases C3H7C6H4NH2 derived from cumene; isopropyl-aniline; especially: the para isomer made by nitration of cumene followed by reduction