densea.[L. densus; akin to Gr. thick with hair or leaves: cf. F. dense.]1. Having the constituent parts massed or crowded together; close; compact; thick; containing much matter in a small space; heavy; opaque; as, a dense crowd; a dense forest; a dense fog.()All sorts of bodies, firm and fluid, dense and rare. (Ray.)To replace the cloudy barrier dense. (Cowper.)2. Stupid; gross; crass; as, dense ignorance.()