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sunfish (n.)

1620s, from sun (n.) + fish (n.). Used of various species, with reference to round shape or brilliant appearance. Short form sunny is attested from 1835.

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Definitions of sunfish from WordNet

sunfish (n.)
the lean flesh of any of numerous American perch-like fishes of the family Centrarchidae;
sunfish (n.)
among the largest bony fish; pelagic fish having an oval compressed body with high dorsal and anal fins and caudal fin reduced to a rudder-like lobe; worldwide in warm waters;
Synonyms: ocean sunfish / mola / headfish
sunfish (n.)
small carnivorous freshwater percoid fishes of North America usually having a laterally compressed body and metallic luster: crappies; black bass; bluegills; pumpkinseed;
Synonyms: centrarchid
From wordnet.princeton.edu