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Efficacious

 - 2 dictionary results

ef⋅fi⋅ca⋅cious

  [ef-i-key-shuhs]
Use Efficacious in a Sentence
–adjective
capable of having the desired result or effect; effective as a means, measure, remedy, etc.: The medicine is efficacious in stopping a cough.
Origin:
1520–30; < L efficāci- (s. of efficāx) effectual. See efficient, -acious

Related forms:
ef⋅fi⋅ca⋅cious⋅ly, adverb
ef⋅fi⋅ca⋅cious⋅ness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To Efficacious
ef·fi·ca·cious   (ěf'ĭ-kā'shəs)   
adj.  Producing or capable of producing a desired effect. See Synonyms at effective.

[From Latin efficāx, efficāc-, from efficere, to effect; see effect.]
ef'fi·ca'cious·ly adv., ef'fi·ca'cious·ness n.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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