This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. (of a gas) Above its critical temperature and critical pressure

adj. Having a mass sufficient to sustain a chain reaction

adj. Above the speed of sound

adj. Above some other critical value or range

Excessively critical; hypercritical.

adj. (especially of fissionable material) able to sustain a chain reaction in such a manner that the rate of reaction increases

"New rules mean that about one fifth of India's new coal plants will be among the efficient (so-called supercritical) plants that are standard fare in much of the rest of the world."

critical   

supercritical flow    supercritical wing    supercritical drying    supercritical field    supercritical airfoil   

liquid-liquid    thin-layer    aldol    hypo-    dry-cleaning