noun any large jellyfish.
2. sunfish ·noun the basking, or liver, shark.
3. sunfish ·noun the opah.
4. sunfish ·noun the moonfish, or bluntnosed shiner.
5. sunfish ·noun a very large oceanic plectognath fish (mola mola, mola rotunda, or orthagoriscus mola) having a broad body and a truncated tail.
6. sunfish ·noun any one of numerous species of perch-like north american fresh-water fishes of the family centrachidae. 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.