An order of reptiles, such as the tortoises and turtles, distinct in having an integral part of the vertebræ, ribs, and sternum united aided by the dermal dishes to be able to form a strong shell. The jaws tend to be included in a horny beak. See reptilia; additionally, Illust. in Appendix.
The Testudinata or shield-reptiles; the turtles and tortoises; an order of Reptilia, when the human anatomy is inclosed in a shell composed of a carapace and a plastron, from between which the head, tail, and four limbs protrude.