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
          [1913 Webster]

   2. (Zool.) The keel of the breastbone of birds.
      [1913 Webster]
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