I. |süpə(r)+ adjective
Etymology: super- + critical
: capable of carrying on a chain reaction in such a manner that the rate of reaction increases — used especially of fissionable material
II. adjective
1. of an airfoil : having a flattened upper surface and a trailing edge which is curved downward so that the shock wave that forms at high subsonic speeds is weaker than that of a conventional airfoil and appears farther aft
2. : being or having a temperature above a critical temperature
supercritical fluid