water moccasin
US /ˈwɑː.t̬ɚ ˈmɑː.kə.sɪn/
UK /ˈwɑː.t̬ɚ ˈmɑː.kə.sɪn/
1.
a venomous pit viper (Agkistrodon piscivorus) of the southeastern United States, typically found in or near water.
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Be careful when hiking near the swamp; there might be a water moccasin.
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The water moccasin is also known as a cottonmouth.