Meaning of supercool

su•per•cool

Pronunciation: (s"pur-kl'), [key]
— v.t.
  1. to cool (a liquid) below its freezing point without producing solidification or crystallization; undercool.
—v.i.
  1. to become supercooled.
—adj.
  1. very cool in temperature, esp. of the maximum coolness possible: used as a setting on air conditioners.
  2. very cool; very sophisticated, up-to-date, unemotional, etc.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.