Carina \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. (Zo["o]l.) The keel of the breastbone of birds.

Source: Webster's Revised Unabridged Dictionary (1913)