superheatPronunciation: /suːpəˈhiːt, sjuː-/ PhysicsDefinition of superheat verb [with object] heat (a liquid) under pressure above its boiling point without vaporization. heat (a vapour) above its temperature of saturation: (as adjective superheated)superheated steam heat to a very high temperature: we superheat the car’s brakes noun [mass noun] the excess of temperature of a vapour above its temperature of saturation. Derivatives superheater noun superheat in other Oxford dictionaries Definition of superheat in the US English dictionary