Hypertext Webster Gateway: "efficacious"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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
law.
Syn: See {Effectual}. -- {Ef`fi*ca"cious*ly}, adv. --
{Ef`fi*ca"cious*ness}, n.
From WordNet (r) 1.7 (wn)
efficacious
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}] [ant: {ineffective}]
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