supercool

[soo-per-kool]
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:
1905–10; super- + cool

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
supercool (ˌsuːpəˈkuːl)
 
vb
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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Science Dictionary
supercool   (s'pər-kl')  Pronunciation Key 
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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Example sentences
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.
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