Etymology
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rattlesnake (n.)

venomous serpent of the Americas noted for the rattle at the end of its tail, 1620s, from rattle + snake (n.).

RATTLE-SNAKE COCKTAIL.*
*So called because it will either cure Rattlesnake bite, or kill Rattlesnakes, or make you see them.
[Harry Craddock, "The Savoy Cocktail Book," 1930]

updated on April 29, 2021

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Definitions of rattlesnake from WordNet

rattlesnake (n.)
pit viper with horny segments at the end of the tail that rattle when shaken;
Synonyms: rattler
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.