REGISTER n.
A lid, stopper, or sliding plate, in a furnace, stove, etc., for regulating the admission of air to the fuel; also, an arrangement containing dampers or shutters, as in the floor or wall of a room or passage, or in a chimney, for admitting or excluding heated air, or for regulating ventilation.
SHUT v.
e, by closing a cock, valve, or gate. -- To shut out, to preclude from entering; to deny admission to; to exclude; as, to shut out rain by a tight roof. -- To shut together, to unite; to close, especially to close by welding. -- To shut up. (a) To close; to make fast the entrances into; as, to shut up a house. (b) T…