COCYTUS, a tributary of the Acheron, supposed like that river to be connected with the lower world, and which consequently came to be described as one of the rivers of hell. It derived its name from κοκύω, to wail or lament. Hence Milton

Cocytus named, of lamentation loud
Heard on the rueful stream.

COD and COD-FISHERY. See ICHTHYOLOGY, and FISHERIES.