Heated to a temperature above the normal boiling point while staying in liquid form, or emotionally in a state of extreme intensity.
From 'super-' (above/beyond) + 'heated' (warmed). The scientific term emerged in the 19th century as steam engines required understanding of extreme temperatures.
Superheated water can stay liquid well above 100°C and will explosively boil if disturbed—it's so unstable that microwave ovens sometimes create this dangerous condition accidentally, which is why heated water warnings exist.
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