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efficacious

 [ef-i-key-shuhs]   Example Sentences Origin

ef·fi·ca·cious

   [ef-i-key-shuhs]
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; < Latin efficāci- (stem of efficāx) effectual. See efficient, -acious

Related forms
ef·fi·ca·cious·ly, adverb
ef·fi·ca·cious·ness, noun
non·ef·fi·ca·cious, adjective
non·ef·fi·ca·cious·ly, adverb
un·ef·fi·ca·cious, adjective
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un·ef·fi·ca·cious·ly, adverb
COLLAPSE
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Efficacious is always a great word to know.
So is callithumpian. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
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Example Sentences
  • We have found that in most of the common cases a homeopathic remedy is frequently efficacious.
  • More efficacious ways of implementing regulation would help solve this problem.
  • Until they are implemented on a suitable scale and found to be efficacious and sustainable, they remain just ideas.
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Collins
World English Dictionary
efficacious (ˌɛfɪˈkeɪʃəs)
 
—adj
capable of or successful in producing an intended result; effective as a means, remedy, etc
 
[C16: from Latin efficāx powerful, efficient, from efficere to achieve; see effect]
 
effi'caciously
 
—adv
 
effi'caciousness
 
—n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

efficacious
1520s, from L. efficaci- (see efficacy) + -ous. Related: Efficaciously.
Online Etymology Dictionary, © 2010 Douglas Harper
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