1. any of various edible North American web-footed turtles living in fresh or brackish water
The Collaborative International Dictionary of English v.0.48:
Terrapin \Ter"ra*pin\, n. [Probably of American Indian origin.]
Any one of numerous species of tortoises living in fresh and
brackish waters. Many of them are valued for food. [Written
also terapin, terrapen, terrapene, turpen, and
Note: The yellow-bellied terrapin (Pseudemys scabra) of the
Southern United States, the red-bellied terrapin
(Pseudemys rugosa or Chrysemys rubriventris),
native of the tributaries Chesapeake Bay (called also
potter, slider, and redfender), and the
diamond-back or salt-marsh terrapin (Malaclemmys
palustris), are the most important American species.
The diamond-back terrapin is native of nearly the whole
of the Atlantic coast of the United States.
Alligator terrapin, the snapping turtle.
Mud terrapin, any one of numerous species of American
tortoises of the genus Cinosternon.
Painted terrapin, the painted turtle. See under Painted.
Speckled terrapin, a small fresh-water American terrapin
(Chelopus guttatus) having the carapace black with round
yellow spots; -- called also spotted turtle.
WordNet (r) 3.0 (2006):
n 1: any of various edible North American web-footed turtles
living in fresh or brackish water