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prophylactic[prophylactic 词源字典]

prophylactic: [16] Prophylactic comes from Greek prophulaktikós, a derivative of the verb prophulássein. This meant literally ‘keep guard in front of a place’, and hence ‘take precautions against’. It was formed from the prefix pro- ‘before’ and phulássein ‘guard’.
[prophylactic etymology, prophylactic origin, 英语词源]