1. supercool - Adjective
2. supercool - Verb
supercool (third-person singular simple present supercools, present participle supercooling, simple past and past participle supercooled)
(physics) To cool a material below its transition temperature without that transition occurring
supercool (comparative more supercool, superlative most supercool)
(informal) Very cool; thoroughly excellent, relaxed, or fashionable.
I have this vintage Harley-Davidson motorcycle jacket. When I put it on, it has this supercool feeling to it. Alicia Keys
If the choice is between doing something supercool and having no one hear it and doing something equally cool and tricking people into putting it on the radio, I don't think the second option is some big sellout. Julian Casablancas
In the presence of nucleating substances the freezing point of water is the same as the melting point, but in the absence of nucleators water can supercool to −42 °C (−43.6 °F, 231 K) before freezing. Source: Internet
Water on a very clean glass surface will often supercool several degrees below the freezing point without freezing. Source: Internet