The Collaborative International Dictionary of English v.0.48:

Superheat \Su`per*heat"\, v. t. [imp. & p. p. Superheated; p.
   pr. & vb. n. Superheating.]
   1. To heat too much, to overheat; as, to superheat an oven.
      [1913 Webster]

   2. (Steam Engine) To heat, as steam, apart from contact with
      water, until it resembles a perfect gas.
      [1913 Webster]

   3. To heat (a liquid) above its boiling point without
      converting it into vapor.
      [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Superheat \Su"per*heat`\, n.
   The increase of temperature communicated to steam by
   superheating it.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

52 Moby Thesaurus words for "superheat":
   animal heat, blood heat, body heat, burning, calidity, caloric,
   chafe, coal heat, convected heat, cook, electric heat,
   electric-heat, fever, fever heat, fire, fire up, foment, gas heat,
   gas-heat, heat, heatedness, heating, hot, hot up, hot-air heat,
   hot-air-heat, hot-water-heat, hotness, hypothermia, incalescence,
   induction heat, molecular heat, mull, oil heat, overheat, preheat,
   radiant heat, recook, reheat, solar heat, steam, steam heat,
   stoke up, superheatedness, tepefy, thermal radiation,
   ultraviolet heat, warm, warm over, warm up, warmness, warmth