supererogatory
adj.
1590s, from Medieval Latin supererogatorius, from supererogat-, stem of supererogare "pay or do additionally" (see supererogation).
| 词汇 | supererogatory | 
| 词根词缀 | Online Etymology Dictionary supererogatory adj. 1590s, from Medieval Latin supererogatorius, from supererogat-, stem of supererogare "pay or do additionally" (see supererogation). | 
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