efficaciousPronunciation: /ˌɛfɪˈkeɪʃəs/Translate efficacious | into Italian Definition of efficacious adjective formal (of something inanimate or abstract) successful in producing a desired or intended result; effective:this treatment was efficacious in some casesDerivatives efficaciously adverb efficaciousness noun Origin: early 16th century: from Latin efficax, efficac- (from efficere 'accomplish': see effect) + -iousefficacious in other Oxford dictionaries Definition of efficacious in the US English dictionary
