efficacious - WordReference.com Dictionary of English

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- See Also:
- - effective demand
  - effective temperature
  - effector
  - effectual
  - effectuate
  - effeminate
  - effendi
  - efferent
  - effervescent
  - effete
  - efficacious
  - efficiency
  - efficient
  - efficient cause
  - effigy
  - effleurage
  - effloresce
  - effluence
  - effluent
  - effluvium
  - efflux
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efficacious

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Concise Oxford English Dictionary © 2008 Oxford University Press:
efficacious /ˌɛfɪˈkeɪʃəs/

▶adjective formal effective.

– derivatives
efficaciously adverb,
efficaciousness noun,
efficacy /ˈɛfɪkəsi/ noun.

– origin C16: from L. efficax, efficac- (from efficere ‘accomplish’) + -ious.

'efficacious' also found in these Oxford entries:

Forum discussions with the word(s) "efficacious" in the title:

agent sure to be efficacious
efficient - effective - efficacious

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