Producing or capable of producing a desired effect. See Synonyms at effective.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "efficacious" in a sentence
"The special grace which we refer to as efficacious is sometimes called irresistible grace."
"Those, however, which follow the last judgment, are simply and absolutely called efficacious volition and nolition, to which the effect succeeds."
"'efficacious' - despite the fact that the chemist sells the medicines."