efficacious Hear it!

efficacious definition

ef·fi·ca·cious (ef′i kā′s̸həs)

adjective

producing or capable of producing the desired effect; having the intended result; effective an efficacious drug

Etymology: L efficax (gen. efficacis) < efficere, to bring to pass, accomplish (see effect) + -ous

Related Forms:

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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