|carina (kəˈriːnə, -ˈraɪ-)|
|—n , pl -nae, -nas|
|a keel-like part or ridge, as in the breastbone of birds or the fused lower petals of a leguminous flower|
|[C18: from Latin: keel]|
carina ca·ri·na (kə-rī'nə, -rē'-)
n. pl. ca·ri·nae (-nē)
A keel-shaped ridge or structure, such as the ridge on the under surface of the fornix of the brain.