[ ef-i-key-shuh s ]
/ ˌɛf ɪˈkeɪ ʃəs /
capable of having the desired result or effect; effective as a means, measure, remedy, etc.: The medicine is efficacious in stopping a cough.
Discover The Influence Of Portuguese On English Via This Quiz!
We’ve gathered some interesting words donated to English from Portuguese … as well as some that just don’t translate at all. Do you know what they mean?
Question 1 of 11
Which of the following bird names traces its immediate origin to Portuguese?
Words nearby efficacious
OTHER WORDS FROM efficacious
ef·fi·ca·cious·ly, adverbef·fi·ca·cious·ness, nounnon·ef·fi·ca·cious, adjectivenon·ef·fi·ca·cious·ly, adverb
un·ef·fi·ca·cious, adjectiveun·ef·fi·ca·cious·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
British Dictionary definitions for non-efficacious
/ (ˌɛfɪˈkeɪʃəs) /
capable of or successful in producing an intended result; effective as a means, remedy, etc
Derived forms of efficaciousefficaciously, adverbefficaciousness, noun
Word Origin for efficacious
C16: from Latin efficāx powerful, efficient, from efficere to achieve; see effect
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012