moccasin
US /ˈmɑː.kə.sɪn/
UK /ˈmɑː.kə.sɪn/

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2.
a venomous pit viper (Agkistrodon piscivorus) of the southeastern US, typically dark brown with a pale belly, found in or near water
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Be careful near the swamp; there might be a water moccasin.
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The bite of a cottonmouth moccasin is venomous.