fish (fĭsh)
n.,
pl. fish or fish·es.
Any of numerous cold-blooded aquatic vertebrates of the superclass Pisces, characteristically having fins, gills, and a streamlined body and including specifically:
Any of the class Osteichthyes, having a bony skeleton.
Any of the class Chondrichthyes, having a cartilaginous skeleton and including the sharks, rays, and skates.
The flesh of such animals used as food.
Any of various primitive aquatic vertebrates of the class Cyclostomata, lacking jaws and including the lampreys and hagfishes.
Any of various unrelated aquatic animals, such as a jellyfish, cuttlefish, or crayfish.
Informal. A person, especially one considered deficient in something: a poor fish.
