a. Nat. Hist. [ad. L. costātus ribbed, having ribs, f. costa rib: see -ATE2 2.] Having a rib or ribs; ribbed: see COSTA.
1819. Pantologia, Costate leaf, in botany, a ribbed leaf.
1881. H. B. Brady, in Jrnl. Microsc. Sc., Jan., 61. The body of the shell strongly costate.
