Meaning of supercritical

su•per•crit•i•cal

Pronunciation: (s"pur-krit'i-kul), [key]
— adj.
  1. extremely critical.
  2. 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.
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