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supercool

[soo-per-kool] /ˌsu pərˈkul/
verb (used with object)
1.
to cool (a liquid) below its freezing point without producing solidification or crystallization; undercool.
verb (used without object)
2.
to become supercooled.
adjective
3.
very cool in temperature, especially of the maximum coolness possible: used as a setting on air conditioners.
4.
Slang. very cool; very sophisticated, up-to-date, unemotional, etc.
Origin
1905-1910
1905-10; super- + cool
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for supercool
  • Surely the eyes of the supercool are already rolling.
  • Cool is what you need to survive here, and supercool is what you need to maintain a semblance of humanity.
  • There is a strong tendency for gallium to supercool below its freezing point.
British Dictionary definitions for supercool

supercool

/ˌsuːpəˈkuːl/
verb
1.
(chem) to cool or be cooled without freezing or crystallization to a temperature below that at which freezing or crystallization should occur. Supercooled liquids are not in equilibrium
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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supercool in Science
supercool
  (s'pər-kl')   
To cool a substance below a phase-transition temperature without the transition occurring. For example, water can be cooled well below the freezing point without freezing (as often happens in the upper atmosphere); the introduction of an impurity or surface can then trigger freezing. Supercooling is an example of hysteresis. Compare superheat.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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