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]