efficacious

Definition

Effective; possessing efficacy.

Etymology

From Old French efficacieux, from Latin efficāx (“efficacious”) + -ous, from efficere (“to effect, to accomplish”); see effect.

Example Sentences

• "This medicine is efficacious."
• "For, that the ordure, which continually gathers on the skin, would ſoon ſtop the pores of it, if the ſweat were not furniſht with ſome efficacious diſſolvent to open and pierce them."
• ""I see," said he, with a smile, "that you, like myself, are trying the effect of this sweet evening for the headach. I have already found it very efficacious, and so, I think, have you,"—again smiling, as he noticed the deep blush which his sudden appearance had produced."

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