The Collaborative International Dictionary of English v.0.48:

Snapper \Snap"per\, n.
   1. One who, or that which, snaps; as, a snapper up of
      trifles; the snapper of a whip.
      [1913 Webster]

   2. (Zool.) Any one of several species of large sparoid food
      fishes of the genus Lutjanus, abundant on the southern
      coasts of the United States and on both coasts of tropical
      America.
      [1913 Webster]

   Note: The red snapper (Lutjanus aya syn. Lutjanus
         Blackfordi) and the gray, or mangrove, snapper
         (Lutjanus griseus) are large and abundant species.
         The name is loosely applied to various other fishes, as
         the bluefish, the rosefish, the red grouper, etc. See
         Rosefish.
         [1913 Webster]

   3. (Zool.) A snapping turtle; as, the alligator snapper.
      [1913 Webster]

   4. (Zool.) The green woodpecker, or yaffle.
      [1913 Webster]

   5. (Zool.) A snap beetle.
      [1913 Webster]

   6. (Teleg.) A device with a flexible metal tongue for
      producing clicks like those of the sounder.
      [Webster 1913 Suppl.]

   7. A string bean. [Colloq., U. S.]
      [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

mangrove snapper \mangrove snapper\ n.
   A fish (Lutjanus griseus) found in shallow waters off the
   coast of Florida; called also gray snapper.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

Lutjanus griseus
    n 1: found in shallow waters off the coast of Florida [syn:
         grey snapper, gray snapper, mangrove snapper,
         Lutjanus griseus]