| 单词 | efficacy |
|---|---|
| 音标 | ['efikəsi] |
| 解释 | n.功效，有效性 |
| 红宝书 | 【英】 n. 有效性,功效(state or quality of being efficacious) 【例】 test the efficacy of a new drug |
| 字源 | efficacy (n.) 1520s, from Latin efficacia "efficacy, efficiency," from efficax (genitive efficacis) "powerful, effective," from stem of efficere "work out, accomplish" (see effect). Earlier in same sense was efficace (c.1200), from Old French eficace (14c.), from Latin efficacia; also efficacite (early 15c.), from Latin efficacitatem. |
| 不择手段背单词 | 无 |
| 趣味全助记 | 【记】源自effect，能带来effect的能力 |
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