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3 definitions found
 for efficacious
From The Collaborative International Dictionary of English v.0.48 :

  Efficacious \Ef`fi*ca"cious\, a. [L. eficax, -acis, fr.
     efficere. See Effect, n.]
     Possessing the quality of being effective; productive of, or
     powerful to produce, the effect intended; as, an efficacious
     Syn: See Effectual. -- Ef`fi*ca"cious*ly, adv.
          [1913 Webster]

From WordNet (r) 3.0 (2006) :

      adj 1: marked by qualities giving the power to produce an
             intended effect; "written propaganda is less efficacious
             than the habits and prejudices...of the readers"-Aldous
             Huxley; "the medicine is efficacious in stopping a cough"
             [ant: inefficacious]
      2: producing or capable of producing an intended result or
         having a striking effect; "an air-cooled motor was more
         effective than a witch's broomstick for rapid long-distance
         transportation"-LewisMumford; "effective teaching methods";
         "effective steps toward peace"; "made an effective entrance";
         "his complaint proved to be effectual in bringing action";
         "an efficacious law" [syn: effective, effectual,
         efficacious] [ant: ineffective, ineffectual,

From Moby Thesaurus II by Grady Ward, 1.0 :

  44 Moby Thesaurus words for "efficacious":
     able, active, adequate, authoritative, capable, charismatic,
     charming, competent, consequential, effective, effectual,
     efficient, enchanting, equal to, estimable, functional, go,
     important, influential, magnetic, momentous, operational,
     operative, personable, persuasive, potent, powerful, practical,
     prestigious, productive, proficient, puissant, reputable,
     serviceable, strong, suasive, substantial, successful, telling,
     up to, useful, virtuous, weighty, winning

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