Definition of efficacious

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< Effexor

efficacy >

ef·fi·ca·cious

(

-k

s) KEY

ADJECTIVE:

Producing or capable of producing a desired effect. See Synonyms at effective.

ETYMOLOGY:
From Latin efficx , efficc-, from efficere, to effect ; see effect

OTHER FORMS:
effi·cacious·ly (Adverb), effi·cacious·ness (Noun)

Thesaurus: synonyms for efficacious

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The American Heritage® Dictionary of the English Language, Fourth Edition.
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