efficacious

形容词 efficacious:

1. marked by qualities giving the power to produce an intended effect
2. producing or capable of producing an intended result or having a striking effect
   同义词：effective, effectual

ef.fi.ca.cious

adj.（形容词）
Producing or capable of producing a desired effect.See Synonyms at effective
灵验的：能产生或产生所期的效果的参见 effective

来源：
From Latin effic3x effic3c-
源自 拉丁语 effic3x effic3c-
from efficere [to effect] * see effect
源自 efficere [生效] *参见 effect

【引伸】
ef.fica.ciously
adv.（副词）
ef.fica.ciousness
n.（名词）