superheat

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su·per·heat / ˌsoōpərˈhēt/ Physics • v. [tr.] heat (a liquid) under pressure above its boiling point without vaporization. ∎  heat (a vapor) above its temperature of saturation. ∎  heat to a very high temperature. • n. the excess of temperature of a vapor above its temperature of saturation. DERIVATIVES: su·per·heat·er n.