‖n. [ L., keel. ]
n. [ NL., fr. L. carina keel. ] (Zool.) A genus of oceanic heteropod Mollusca, having a thin, glassy, bonnet-shaped shell, which covers only the nucleus and gills. [ 1913 Webster ]
‖n. pl. [ NL., Fem. pl. fr. L. carinatus. See Carinate. ] A grand division of birds, including all existing flying birds; -- So called from the carina or keel on the breastbone. [ 1913 Webster ]