Pronunciation: (sOO"pur-kOOl'), [key]
to cool (a liquid) below its freezing point without producing solidification or crystallization; undercool.
to become supercooled.
1. very cool in temperature, esp. of the maximum coolness possible: used as a setting on air conditioners.
2. Slang.very cool; very sophisticated, up-to-date, unemotional, etc.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.