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Meaning of undercool

un•der•cool

Pronunciation: (un"dur-kl'), [key]
— v.t.
    1. to cool less than necessary for a given process or purpose.
    2. to supercool.
  1. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.