• efficacious

efficacious

views updated May 23 2018

ef·fi·ca·cious / ˌefiˈkāshəs/ • adj. formal (typically of something inanimate or abstract) successful in producing a desired or intended result; effective: the vaccine has proved both efficacious and safe.DERIVATIVES: ef·fi·ca·cious·ly adv.ef·fi·ca·cious·ness n.

The Oxford Pocket Dictionary of Current English

efficacious

views updated May 29 2018

efficacious XVI. f. L. efficāx, -āc, f. efficere; see EFFECT, -ACIOUS.
So efficacity XV. — F. — L. efficient making a thing what it is XIV; adequately operative or skilled XVIII. —prp. of L. efficere. efficiency XVI.

The Concise Oxford Dictionary of English Etymology T. F. HOAD

More From encyclopedia.com

About this article

efficacious

All Sources -
Updated Aug 08 2016 About encyclopedia.com content Print Topic

You Might Also Like