The hard covering of a tortoise or turtle; the material of which this is composed: cf. tortoiseshell, n.

The shell, esp. the upper shell or carapace, of a tortoise, consisting of horny scales covering the dermal skeleton. with a and plural.

Zoology. The ventral part (plastron) of the shell of a tortoise or turtle. Cf. breast shell n. (a) at breast, n. compounds 1c.

Zoology. The ventral part of the shell of a tortoise or turtle.

(a) adj. in hyposternal bone; (b) n. (St. Hilaire's name for) the hypoplastron of a chelonian; also called hypoˈsternum.

(a) Zoology a neural bone of a chelonian (cf. also sense B.); (b) Embryology a thickened band of neuroectoderm located in the dorsal midline of…

Zoology. In chelonians: the most anterior of the median row of bony plates of the carapace, which forms the dorsal part of the opening for the neck.

(Huxley's name for) the third lateral piece of the plastron of Chelonia: = hyposternal adj. n.

= neural plate n. at neural, adj. n.compounds.

Zoology. In chelonians: each of the row of eight or more bony plates lying along the dorsal line of the carapace between the nuchal and the pygal…

= sense B.