| 单词 | efficacious |
|---|---|
| 音标 | [`efi'keiʃəs] |
| 解释 | a.有效的 |
| 红宝书 | 【英】 adj. 有效的(producing the desired result) 【例】 an efficacious treatment, medicine(有效治疗) |
| 字源 | efficacious (adj.) "sure to have the desired effect" (often of medicines), 1520s, from Latin efficaci-, stem of efficax (see efficacy) + -ous. Related: Efficaciously; efficaciousness. |
| 不择手段背单词 | 无 |
| 趣味全助记 | 【记】等于effective |
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