a closed vessel or arrangement of vessels and tubes, together with a furnace or other heat source, in which steam or other vapor is generated from water to drive turbines or engines, supply heat, process certain materials, etc. Compare fire-tube boiler , water-tube boiler .

a vessel, as a kettle, for boiling or heating.

British . a large tub in which laundry is boiled or sterilized.

a tank in which water is heated and stored, as for supplying hot water.

noun

cauldron , copper , furnace , geyser , kettle , retort