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Definition of efficacious


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ef·fi·ca·cious  audio  (f-kshs) 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)


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The American Heritage® Dictionary of the English Language, Fourth Edition.
Copyright © 2000 by Houghton Mifflin Company.
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