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Pronunciation:  `efu'keyshus

WordNet Dictionary
  1. [adj]  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"
  2. [adj]  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"

EFFICACIOUS is a 11 letter word that starts with E.


 Synonyms: effective, effectual, hard-hitting, impelling, impressive, rough-and-ready, telling, trenchant
 Antonyms: ineffective, ineffectual, inefficacious, uneffective
 See Also: efficacious, efficient, potent, powerful, strong, useful, utile



Webster's 1913 Dictionary
\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. --
     {Ef`fi*ca"cious*ness}, n.

Biology Dictionary
 Definition: Having the ability or power to produce a desired effect.
Thesaurus Terms
 Related Terms: 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