Undercool Definition
 ŭndər-ko͝ol 
  undercool
  
    verb
  
 To supercool.
 American Heritage 
Webster's New World 
To cool insufficiently.
Wiktionary 
(physics) To supercool.
Wiktionary 
Origin of Undercool
-  under- +"Ž cool From Wiktionary 
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