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excrement[excrement 词源字典]

excrement: [16] Latin excrēmentum meant originally ‘that which is sifted out’ (it was a derivative of the verb excernere, a compound formed from the prefix ex- ‘out’ and cernere ‘sift, decide’, from which English gets certain). Hence it was applied metaphorically to any substance that is excreted from or secreted by the body, including sweat, nasal mucus, and milk, as well as faeces. (English acquired excrete [17], incidentally, from the past participle of excernere, excrētus.) This very general sense survived in English into the mid 18th century, when it was finally ousted by the more specific ‘faeces’. (Increment, by the way, is a completely unrelated word, coming ultimately from Latin crēscere ‘grow’.)
=> certain, crime, critic, discern, discriminate, secret[excrement etymology, excrement origin, 英语词源]