rat·tle·snake

[rat-l-sneyk]
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:
1620–30, Americanism; rattle1 + snake

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
rattlesnake (ˈrætəlˌsneɪk) [Click for IPA pronunciation guide]
 
n
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 10th Edition
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00:10
Rattlesnake is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a gadget; dingus; thingumbob.
Example sentences
It's said that her hand movements are quicker than the striking speed of a
  rattlesnake.
There is no doubt that the infrared signal is designed to take advantage of the
  rattlesnake's heat-seeking powers.
And other snakes are set to join the ranks of the sequenced, including the
  garter snake, the rattlesnake and the king cobra.
Its only excitement was an annual rattlesnake round-up.
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