Meaning of “efficacious” in the English Dictionary

English

"efficacious" in English

See all translations

efficaciousadjective

uk /ˌef.ɪˈkeɪ.ʃəs/ us /ˌef.əˈkeɪ.ʃəs/ formal

Examples from literature

  • Caution is at least as efficacious a protection against him as courage. 
  • Many efforts were made for his release, the most efficacious by the Queen of France. 
  • Pieces of certain woods are believed efficacious for rheumatism, and old men especially may often be seen with them tied around the limbs. 
  • The penalty should certainly prove efficacious, he observed lightly. 
  • They resort to any and every agent which has been proved efficacious, whether it be vegetable or mineral. 

(Definition of “efficacious” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)