[noun soo-per-heet; verb soo-per-heet]
verb (used with object)
  1. to heat to an extreme degree or to a very high temperature.
  2. to heat (a liquid) above its boiling point without the formation of bubbles of vapor.
  3. to heat (a gas, as steam not in contact with water) to such a degree that its temperature may be lowered or its pressure increased without the conversion of any of the gas into liquid.

Origin of superheat

First recorded in 1855–60; super- + heat
Related formssu·per·heat·er, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for superheat

Historical Examples of superheat

  • It was 11AM in Florida and she was into her second glass of lemonade as the sun began to superheat the air.


    Cory Doctorow

  • This more particularly applies to the electrical water, superheat and vacuum readings.

    Steam Turbines

    Hubert E. Collins

British Dictionary definitions for superheat


verb (tr)
  1. to heat (a vapour, esp steam) to a temperature above its saturation point for a given pressure
  2. to heat (a liquid) to a temperature above its boiling point without boiling occurring
  3. to heat excessively; overheat
Derived Formssuperheater, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

superheat in Science


  1. To heat a substance above a phase-transition temperature without the transition occurring. For example, water can be heated above its boiling point without boiling; the introduction of an impurity or physical disturbance can then trigger boiling. Superheating is an example of hysteresis. Compare supercool.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.