philtre (n.)youdaoicibaDictYouDict[philtre 词源字典]
also philter, "love potion," 1580s, from Middle French philtre (1560s), from Latin philtrum (plural philtra) "love potion," from Greek philtron "a love-charm," literally "to make oneself beloved," from philein "to love" (from philos "loving;" see philo-) + instrumental suffix -tron.[philtre etymology, philtre origin, 英语词源]
philtrum (n.)youdaoicibaDictYouDict
dimple in the middle of the upper lip, 1703, medical Latin, from Greek philtron, literally "love charm" (see philtre).