(1):

(v. t.) To heat too much, to overheat; as, to superheat an oven.

(2):

(v. t.) To heat, as steam, apart from contact with water, until it resembles a perfect gas.

(3):

(v. t.) To heat a liquid above its boiling point without converting it into vapor.

(4):

(n.) The increase of temperature communicated to steam by superheating it.