carina

Concise Oxford English Dictionary © 2008 Oxford University Press:
carina /kəˈrʌɪnə, -ˈriː-/

▶noun (pl. carinae /-niː/ or carinas)

• 1 Zoology a keel-shaped structure, especially the ridge of a bird's breastbone to which the main flight muscles are attached.

• 2 Anatomy a cartilage situated at the point where the trachea divides into the two bronchi.

– derivatives
carinal adjective.

– origin C18: from L., ‘keel’.