Definition of efficacious
- an efficacious remedy
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taking a cookie break while studying is one of the most efficacious ways of rejuvenating the mind that I have ever discovered
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'efficacious.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
First Known Use: 1528See Words from the same year
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an inn where caravans rest at night
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