[n. soo-per-heet; v. soo-per-heet]
the state of being superheated.
the amount of superheating.
verb (used with object)
to heat to an extreme degree or to a very high temperature.
to heat (a liquid) above its boiling point without the formation of bubbles of vapor.
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.

1855–60; super- + heat

superheater, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
superheat (ˌsuːpəˈhiːt)
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
superheat   (s'pər-hēt')  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The time required for the liquid to attain this superheat is called the waiting period.
In this approach a single phase-change material can be used to preheat, boil, and superheat steam.
Size and operating characteristics as recommended by manufacturer of evaporator and factory set for superheat requirements.
The superheat and subcooling both approach constant values in each case as the temperature field approaches the stationary state.
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