Merriam-Webster Collegiate Dictionary - superheat

 I. transitive verb  Date: 1859  1. to heat (a vapor not in contact with its own liquid) so as to cause to remain free from suspended liquid droplets ~ed steam  2. to heat (a liquid) above the boiling point without converting into vapor  • ~er noun  II. noun  Date: 1884 the extra heat imparted to a vapor in ~ing it from a dry and saturated condition; also the corresponding rise of temperature