ADJ.
high, increased
SUPERHEAT + NOUN
oven
ADV.
usually
verb
To heat a liquid above its boiling point
To heat a vapour above its saturation point
To heat too much, to overheat.
to superheat an oven
noun
The excess of temperature of a vapour above its temperature of saturation.
In addition to all this, the fluidity of the steam itself was much increased by high superheat, usually achieved by means of the Houlet superheater.