efficacious
UK /ˌɛf.ɪˈkeɪ.ʃəs/US /ˌɛf.əˈkeɪ.ʃəs/
adjective1
- This medicine is efficacious.
forms
more efficacious · most efficacious
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more efficacious · most efficacious
This dictionary works without the internet: on your phone · in Chrome