NOUN (2)

1. a keel-shaped constellation in the southern hemisphere; contains the start Canopus;

2. any of various keel-shaped structures or ridges such as that on the breastbone of a bird or that formed by the fused petals of a pea blossom;

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]

WordNet (r) 3.0 (2006):

Carina
    n 1: a keel-shaped constellation in the southern hemisphere;
         contains the start Canopus
    2: any of various keel-shaped structures or ridges such as that
       on the breastbone of a bird or that formed by the fused
       petals of a pea blossom