One of the mysteries of the English language finally explained.
A large black colubrid snake of tropical America, Clelia clelia, which feeds on other snakes, being immune to their venom.
Early 20th century; earliest use found in Theodore Roosevelt (1858–1919). From Portuguese muçurana from Tupi moçu'rana mussurana from moçu kind of eel-like fish + rana resembling.
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