arbor vitae (n.)youdaoicibaDictYouDict[arbor vitae 词源字典]
type of evergreen shrub, 1660s, name given by French physician and botanist Charles de Lécluse (1525-1609), Latin, literally "tree of life." Also used in late 18c. rogue's slang as a cant word for "penis."[arbor vitae etymology, arbor vitae origin, 英语词源]