Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • intransitive verb To cool (a substance) below a phase-transition temperature without the transition occurring; for example, to cool a gas below the boiling point without condensation or to cool a liquid below the freezing point without solidification.
  • intransitive verb To become supercooled.

from The Century Dictionary.

  • To cool (a liquid) below its freezing-point without producing solidification. Also overcool and undercool.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • verb physics To cool a material below its transition temperature without that transition occurring
  • adjective informal Very cool; thoroughly excellent, relaxed, or fashionable.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

super- +‎ cool

Examples

  • Either that, or they made Johnson into some kind of supercool Cyborg Senator.

    Tim Johnson Leaves Hospital

  • They accumulate glycerol in their tissues and, although they are usually susceptible to freezing, are able to "supercool" whereby the body fluids remain liquid at temperatures well below the freezing point [6].

    Conservation of arctic species

  • What's more, vegetables in the Brassica family - as well as leaf vegetables in other families, such as spinach - are genetically predisposed to "supercool," which means that the liquids within them stay in a liquid state even when temperatures are below freezing.

    chron.com Chronicle

  • What's more, vegetables in the Brassica family - as well as leaf vegetables in other families, such as spinach - are genetically predisposed to "supercool," which means that the liquids within them stay in a liquid state even when temperatures are below freezing.

    chron.com Chronicle

  • Throughout the show's second season they had a brilliant running gag at the expense of the drug war: In nearly every episode there were references to a dangerous new street substance known as "supercool," a sweet-tasting white powder capable of inducing powerful behavioural effects in children and dental problems in frequent users.

    Jack's Newswatch

  • The joke, never stated openly (indeed, one feels like an idiot explaining it), was that "supercool" is ordinary cane sugar.

    Jack's Newswatch

  • My supercool webcomic SideChicks is free on the internet.

    PR: What Not to Do: Free Online Bait and Switch » Comics Worth Reading

  • To send natural gas across the oceans, companies must supercool the fuel to minus 260 degrees and convert it to liquid form so it can be loaded onto tankers.

    Gas Exports Ignite a Feud

  • Strawberry jam, with its mushy, slightly leathery fruit and syrupy flavour, always takes me back to those sunburnt days, when rollerskates were supercool, and summer fruit came with a lurid scoop of Gino Ginelli rather than a sprinkling of black pepper.

    How to make perfect strawberry jam

  • If you look, they are out there but in reality a supercool replica stormtrooper helmet is still sure to be a hot collectible in the years to come.

    SciFi, Fantasy & Horror Collectibles - Part 1129

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