v. t.
n. The increase of temperature communicated to steam by superheating it. [ 1913 Webster ]
heated to a temperature above the boiling point at the ambient pressure; -- said of liquids. In such an unstable condition, a small disturbance of the liquid can cause a rapid and sometimes violent ebullition of vapor. [ PJC ]
n. (Steam Engine) An apparatus for superheating steam. [ 1913 Webster ]