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From The Collaborative International Dictionary of English v.0.48:
Testudinata \Tes*tu`di*na"ta\, n. pl. [Nl. See Testudo.] (Zool.) An order of reptiles which includes the turtles and tortoises. The body is covered by a shell consisting of an upper or dorsal shell, called the carapace, and a lower or ventral shell, called the plastron, each of which consists of several plates. [1913 Webster] Testudinate