carinaPronunciation: /kəˈrʌɪnə, -ˈriː-/Definition of carina noun (plural carinae /-niː/ or carinas) chiefly Biology a keel-shaped structure, in particular: the ridge of a bird’s breastbone, to which the main flight muscles are attached. a cartilage situated at the point where the trachea (windpipe) divides into the two bronchi. Derivatives carinal adjective Origin: early 18th century: from Latin, 'keel'carina in other Oxford dictionaries Definition of carina in the US English dictionary