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efficacious
[efficacious 词源字典]
efficacious:
see
effect
[efficacious etymology, efficacious origin, 英语词源]
efficacious (adj.)
"sure to have the desired effect" (often of medicines), 1520s, from Latin
efficaci-
, stem of
efficax
"effectual, powerful" (see
efficacy
) +
-ous
. Related:
Efficaciously
;
efficaciousness
.