supercool adjective. ['su:pǝku:l, su:pǝ'ku:l, 'sju:-] colloq. L20.
[from SUPER- 3 + COOL adjective.]
Very cool, relaxed, or good.

[TahlilGaran] English Dictionary ▲

supercool verb. [su:pǝ'ku:l, sju:-] L19.
[from SUPER- 3 + COOL verb.]
1. verb trans. Cool (a liquid) to below its freezing point without solidification or without the occurrence of crystallization; cool to below the temperature of a phase transition without the change of phase occurring. L19.

2. verb intrans. Undergo supercooling. M20.

[TahlilGaran] English Dictionary ▲