cottonmouth
US /ˈkɑːt.ən.maʊθ/
UK /ˈkɑːt.ən.maʊθ/
1.
a venomous pit viper (Agkistrodon piscivorus) of the southeastern United States, typically found near water.
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Be careful when hiking near the swamp; you might encounter a cottonmouth.
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The cottonmouth is also known as the water moccasin.