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.

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

Source: Webster's Revised Unabridged Dictionary (1913)