<p><strong>Noun</strong></p><ul><li>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.</li><li>a vessel, as a kettle, for boiling or heating.</li><li>British: a large tub in which laundry is boiled or sterilized.</li><li>a tank in which water is heated and stored, as for supplying hot water.</li></ul>