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large species having three ridges on its back; found in southeastern United States

1. : a voracious snapping turtle (Macrochelys temminckii) of the rivers of the Gulf states differing from the common snapping turtle in its larger size which in old age reaches nearly 150 pounds in weight and 5 feet in length, its scaly head, and its numerous small scales beneath the tail

2. : a snapping turtle (Chelydra serpentina)

alligator snapping turtle or alligator snapper,

a large, freshwater snapping turtle of the southeastern United States. It is the largest freshwater turtle of North America, sometimes growing to about 3 feet in length and weighing up to 140 pounds.