: either of two large American freshwater turtles (family Chelydridae) with a large head, powerful jaws, a long tail, and a strong musky odor:
a
: one (Chelydra serpentina) that has the head covered with smooth skin, has large plates in a double row on the underside of the tail, and is distributed from eastern Canada to Central America
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Merriam-Webster unabridged
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