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undercool

[uhn-der-kool] /ˌʌn dərˈkul/
verb (used with object)
1.
Chemistry.
  1. to cool less than necessary for a given process or purpose.
  2. to supercool.
2.
Metallurgy. to cool (molten metal) without forming crystals to a temperature below that at which crystallization normally takes place:
Metal must be absolutely still to be undercooled.
Origin of undercool
1900-1905
First recorded in 1900-05; under- + cool
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for undercool

undercool

/ˌʌndəˈkuːl/
verb
1.
a less common word for supercool
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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