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From The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster] 2. (Zool.) The keel of the breastbone of birds. [1913 Webster]