Dictionary
su•per•crit•i•cal
Pronunciation: (sOO"pur-krit'i-kul), [key]—
adj.
1. extremely critical.
2. Physics.pertaining to a mass of radioactive material in which the rate of a chain reaction increases with time.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.