any of several edible North American turtles of the family Emydidae, inhabiting fresh or brackish waters, esp. the diamondback terrapin: some are threatened or endangered.
2.
any of various similar turtles.
Origin: 1605–15; earlier torope (< Virginia Algonquian < Eastern Algonquian *to⋅rəpe⋅w variety of turtle > Munsee Delaware tó⋅lpe⋅w) + -in, of uncert. orig.
ter·ra·pin (těr'ə-pĭn) n. Any of various North American aquatic turtles of the family Emydiolae, especially the genus Malaclemys, which includes the diamondback terrapin.