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[ef-i-key-shuh s] /ˌɛf ɪˈkeɪ ʃəs/

capable of having the desired result or effect; effective as a means, measure, remedy, etc.:
The medicine is efficacious in stopping a cough.
capable of or successful in producing an intended result; effective as a means, remedy, etc

“sure to have the desired effect” (often of medicines), 1520s, from Latin efficaci-, stem of efficax (see efficacy) + -ous. Related: Efficaciously; efficaciousness.


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