water moccasin

noun
1.
the cottonmouth.
2.
any of various similar but harmless snakes, as a water snake of the genus Nerodia.

Origin:
1815–25, Americanism

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
water moccasin
 
n
Also called: cottonmouth a large dark grey venomous snake, Agkistrodon piscivorus, of swamps in the southern US: family Crotalidae (pit vipers)

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
So, the next time you're sitting on a dock and a snake swims by, don't worry--it's not a water moccasin.
Many people falsely believe that any snake seen in or near the water is a water moccasin, also known as a cottonmouth.
It goes by the common names of cottonmouth or water moccasin.
Sometimes this snake is mistaken for the poisonous water moccasin snake.
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