The Collaborative International Dictionary of English v.0.48:

Procyon \Pro"cy*on\, n. [L., a constellation which rises before
   the Dog Star, Gr. ?; ? before + ? a dog. ]
   [1913 Webster]
   1. (Astron.) A star of the first magnitude in the
      constellation Canis Minor, or the Little Dog.
      [1913 Webster]

   2. (Zool.) A genus of mammals including the raccoon.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Procyon
    n 1: the brightest star in Canis Minor
    2: the type genus of the family Procyonidae: raccoons [syn:
       Procyon, genus Procyon]