serpent: [14] The serpent is etymologically a ‘crawling’ animal. The word comes via Old French serpent from Latin serpēns, a noun use of the present participle of serpere ‘crawl, creep’. This was a close relative of Greek hérpein ‘creep’, from which English gets herpes [17] (etymologically the ‘creeping’ disease) and herpetology ‘study of reptiles’ [19]. => herpes[serpent etymology, serpent origin, 英语词源]