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pumice[pumice 词源字典]

pumice: [15] Pumice comes via Old French pomis from Latin pūmex ‘pumice’. This went back to a prehistoric Indo-European *poimo-, source also of English foam and of Latin spūma ‘foam, froth’ (from which English gets spume).
=> foam, spume[pumice etymology, pumice origin, 英语词源]