Category:Efficacious

Ef`fi*ca"cious, a. Etym: [L. eficax, -acis, fr. efficere. See Effect, n.]

Defn: 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.