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Webster 1828 Edition

Efficacious

EFFICA'CIOUS

,
Adj.
[L. efficax, from efficio. See Effect.]
Effectual; productive of effects; producing the effect intended; having power adequate to the purpose intended; powerful; as an efficacious remedy for disease.

Definition 2024

efficacious

efficacious

English

Adjective

efficacious ‎(comparative more efficacious, superlative most efficacious)

  1. Effective; possessing efficacy.

Related terms

Translations

External links

  • efficacious in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
  • efficacious in The Century Dictionary, The Century Co., New York, 1911

Etymology

From Old French efficacieux, from Latin efficax ‎(“efficacious”), from efficere ‎(“to effect, accomplish, to”); see effect.

Pronunciation

  • Rhymes: -eɪʃəs

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