Source : Webster's Revised Unabridged Dictionary (1913)

Sunfish \Sun"fish`\, n. (Zo["o]l.)
   (a) A very large oceanic plectognath fish ({Mola mola}, {Mola
       rotunda}, or {Orthagoriscus mola}) having a broad body
       and a truncated tail.
   (b) Any one of numerous species of perch-like North American
       fresh-water fishes of the family {Centrachid[ae]}. They
       have a broad, compressed body, and strong dorsal spines.
       Among the common species of the Eastern United States are
       {Lepomis gibbosus} (called also {bream}, {pondfish},
       {pumpkin seed}, and {sunny}), the blue sunfish, or
       dollardee ({L. pallidus}), and the long-eared sunfish
       ({L. auritus}). Several of the species are called also
       {pondfish}.
   (c) The moonfish, or bluntnosed shiner.
   (d) The opah.
   (e) The basking, or liver, shark.
   (f) Any large jellyfish.

Pondfish \Pond"fish`\, n. (Zo["o]l.)
   Any one of numerous species of American fresh-water fishes
   belonging to the family {Centrarchid[ae]}; -- called also
   {pond perch}, and {sunfish}.

   Note: The common pondfish of New England ({Lepomis gibbosus})
         is called also {bream}, {pumpkin seed}, and {sunny}.
         See {Sunfish}. The long-eared pondfish ({Lepomis
         auritus}) of the Eastern United States is distinguished
         by its very long opercular flap.

Source : WordNet®

Lepomis gibbosus
     n : small brilliantly colored North American sunfish [syn: {pumpkinseed}]