verb (used without object)
  1. to become supercooled.
  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.

Origin of supercool

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

Examples from the Web for supercooling

Historical Examples of supercooling

British Dictionary definitions for supercooling


  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

supercooling in Science


  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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.