box turtle Definition

any of several North American land turtles (genus Terrapene) capable of withdrawing into their shell and closing it by hinged joints in the lower half —called also box tortoise

any of several chiefly semiaquatic, Asian turtles (genera Cuora and Pyxidea of the family Geoemydidae) that have a carapace with a median keel and are capable of withdrawing into their shell and closing it by hinged joints in the plastron