the world > matter > properties of materials > temperature > heat > heating or making hot > that which or one who heats > [noun] > a device for heating or warming > devices for heating buildings, rooms, etc. > smoke-hole > for a stove-pipe in a tent (2)
North American. A protective metal sleeve through which a stove pipe exits, usually on a roof.
an outlet providing a safe release of pressure, heat, etc. (also figurative); spec. = sense 13.