Definition of efficacious

Reference

	Dictionary
	Encyclopedia
	Thesaurus
	World Factbook
	Spanish Dictionary
	Anatomy
	Conversion Calculator

Word of the Day

rationale
Definition: (noun) an underlying reason or explanation.
Petersons.com

Add Word of the Day to your personalized My Yahoo! page:

About My Yahoo! and RSS »

Email this page to a friend

< 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

Visit our partner's site

Provided by Houghton Mifflin
		eReference -- Download this interactive reference software to your desktop computer