Part of speech: adverb


Part of speech: noun


Part of speech: adjective

Having efficacy; effective; effectual.

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Usage examples "efficacious":

  1. One touch of danger is almost as efficacious as one touch of nature. - "The Honorable Peter Stirling and What People Thought of Him", Paul Leicester Ford.
  2. Then by Jove I'll see if it will prove equally efficacious here. - "The Voyage of the Aurora", Harry Collingwood.
  3. This treatment is always efficacious, as you are absolutely sure of getting what is necessary for the land. - "Making a Lawn", Luke Joseph Doogue.