SUN'FISH, noun [sun and fish.] A name of the diodon, a genus of fishes of a very singular form, appearing like the fore part of the body of a very deep fish amputated in the middle. The sunfish is the Tetraodon mola of Linne. 1. The basking shark.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI