Carina
Carina , noun
[Latin, keel.]
1.
(Botany) A keel
(a)
(Botany) That part of a papilionaceous flower, consisting of two petals, commonly united, which incloses the organs of fructification
(b)
(Botany) A longitudinal ridge or projection like the keel of a boat.
2.
(Zoology) The keel of the breastbone of birds.