Shaped like the keel or prow of a ship; having a carina or keel; as, a carinate calyx or leaf; a carinate sternum (of a bird).

a. (L. carinatus, from carina, a keel) shaped like the keel of a ship; having a longitudinal prominence on the back, like a keel; applied to a calyx, corolla or leaf.

having a keel or ridge.