cottonmouth

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cottonmouth:

see water moccasinwater moccasin
or cottonmouth,
highly venomous snake, Ancistrodon piscivorus, of the swamps and bayous of the S United States. Like the closely related copperhead, it is a pit viper and has a heat-sensitive organ for detecting warm-blooded prey.
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cottonmouth

[′kät·ən‚mau̇th]
(vertebrate zoology)