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supercool

[soo-per-kool]
verb (used with object)
  1. to cool (a liquid) below its freezing point without producing solidification or crystallization; undercool.
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verb (used without object)
  1. to become supercooled.
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adjective
  1. very cool in temperature, especially of the maximum coolness possible: used as a setting on air conditioners.
  2. Slang. very cool; very sophisticated, up-to-date, unemotional, etc.
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Origin of supercool

First recorded in 1905–10; super- + cool
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for supercool

supercool

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
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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

supercool in Science

supercool

[sōō′pər-kōōl]
  1. 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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.