MOSS, a seaport of Norway, in Smaalenene amt (county), on the east shore of Christiania Fjord, 37 m. S. of Christiania by the Gothenburg railway. Pop. (1900), 8941. Here was signed, on the 14th of August 1814, the convention which united Norway to Sweden. Timber and wood pulp are chief exports, grain and coal are imported. The port affords 13 to 22 ft. of water beside the quays.