cobra: [19] Cobra is a shortening of Portuguese cobra de capella, which came into English in India in the 17th century. This meant literally ‘snake with a hood’: cobra from Latin colubra ‘snake’ and capella (referring of course to the ‘hood’ it makes when agitated, by spreading out the skin at the side of its head) from Vulgar Latin *cappellus ‘little cape’, from late Latin cappa ‘hood’. => cap, cape, chapel, chaperon[cobra etymology, cobra origin, 英语词源]