Definition of efficacious

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  • efficacious is a valid Scrabble US word with a point value of 21
  • efficacious is a valid Scrabble UK word with a point value of 21
  • efficacious is a valid Words with friends word with a point value of 24

Definition of efficacious

  • producing or capable of producing an intended result or having a striking effect (adjective)

    Examples

    1. an efficacious law

    Synonyms

    1. effective
    2. effectual
  • marked by qualities giving the power to produce an intended effect (adjective)

    Examples

    1. written propaganda is less efficacious than the habits and prejudices...of the readers
    2. the medicine is efficacious in stopping a cough

See definition of efficacious in Merriam Webster