v. [f. SUPER- 9 b + HEAT v.] trans. To heat to a very high temperature; esp. to raise the normal temperature of (steam) in order to increase its pressure.
1859. Times, 23 April, 10/4. The various proposed methods of superheating steam.
1861. Leeds Mercury, 2 Nov. It is found most advantageous to superheat the steam to about 100 degrees above the temperature of plain steam.
1875. Knight, Dict. Mech., 2333/1. Steam-chimney, an annular chamber around the chimney of a boiler-furnace for superheating steam.
Hence Superheat sb., the state of being superheated; the excess of temperature of a vapor above its temperature of saturation.
1884. Methodist Mag., 787. Solubility is increased by heat, superheat, and pressure.
1903. Engineering Mag., Feb., 756. A superheat of 100° F., or 55° C.
