rattlesnake

[ rat-l-sneyk ]
/ ˈræt lˌsneɪk /

noun

any of several New World pit vipers of the genera Crotalus and Sistrurus, having a rattle composed of a series of horny, interlocking elements at the end of the tail.

Origin of rattlesnake

An Americanism dating back to 1620–30; rattle1 + snake
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for rattlesnake

rattlesnake

/ (ˈrætəlˌsneɪk) /

noun

any of the venomous New World snakes constituting the genera Crotalus and Sistrurus, such as C. horridus (black or timber rattlesnake): family Crotalidae (pit vipers). They have a series of loose horny segments on the tail that are vibrated to produce a buzzing or whirring sound
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012