terrapin

noun

• 1 (also diamondback terrapin) a small edible turtle with lozenge-shaped markings on its shell, found in coastal marshes of the eastern US.

  • Malaclemys terrapin, family Emydidae

• 2a freshwater turtle, especially one of the smaller kinds of the Old World. Also called turtle.

  • Emydidae and other families, order Chelonia: several genera and species