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supercritical

[soo-per-krit-i-kuh l] /ˌsu pərˈkrɪt ɪ kəl/
adjective
1.
extremely critical.
2.
Physics. pertaining to a mass of radioactive material in which the rate of a chain reaction increases with time.
Origin
1600-1610
1600-10; super- + critical
Related forms
supercritically, adverb
supercriticalness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for super-critical

supercritical

/ˌsuːpəˈkrɪtɪkəl/
adjective
1.
(physics) (of a fluid) brought to a temperature and pressure higher than its critical temperature and pressure, so that its physical and chemical properties change
2.
(nuclear physics) of or containing more than the critical mass
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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