Terrapin

n.
  1. Any one of numerous species of tortoises living in fresh and brackish waters. Many of them are valued for food.
    2. 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.