Dictionary

efficacious

adjective ef·fi·ca·cious \ˌe-fə-ˈkā-shəs\

: having the power to produce a desired result or effect

Full Definition of EFFICACIOUS

:  having the power to produce a desired effect <an efficacious remedy>
ef·fi·ca·cious·ly adverb
ef·fi·ca·cious·ness noun

Examples of EFFICACIOUS

  1. <taking a cookie break while studying is one of the most efficacious ways of rejuvenating the mind that I have ever discovered>

Origin of EFFICACIOUS

Latin efficac-, efficax, from efficere
First Known Use: 1528

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