any of a family (Acipenseridae, order Acipenseriformes) of large, edible, primitive bony fishes having rows of spiny plates along the body and a projecting snout: valuable as a source of caviar and isinglass
See sturgeon in American Heritage Dictionary 4
stur·geon
noun
Any of various large ganoid freshwater and marine fishes of the family Acipenseridae of the Northern Hemisphere, having edible flesh and valued as a source of caviar and isinglass.
Origin: Middle English, from Anglo-Norman, from Old French estourgeon, of Germanic origin.