Ca*ri"na (?), n. [L., keel.]
1. Bot.
A keel
. (a)
That part of a papilionaceous flower, consisting of two petals, commonly united, which incloses the organs of fructification
. (b)
A longitudinal ridge or projection like the keel of a boat.
2. Zool.
The keel of the breastbone of birds.
© Webster 1913.