su·​per·​cool | \ ˌsü-pər-ˈkül How to pronounce supercool (audio) \
supercooled; supercooling; supercools

Definition of supercool

 (Entry 1 of 2)

transitive verb

: to cool below the freezing point without solidification or crystallization



Definition of supercool (Entry 2 of 2)

: extremely cool: such as
a : showing extraordinary reserve and self-control
b : being the latest style or fashion

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Synonyms & Antonyms for supercool

Synonyms: Adjective

Antonyms: Adjective

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Examples of supercool in a Sentence

Adjective the teen picked out some supercool, superexpensive sneakers
Recent Examples on the Web: Verb Gizmodo reports that some whimsical scientists have supercooled their Lego bricks in order to test for heat tolerance. Caroline Delbert, Popular Mechanics, "Why Scientists Supercooled LEGO Bricks to Near Absolute Zero," 26 Dec. 2019 Any potential solution, like one proposed in 2018 that uses cesium gas, must combine extremely high-level knowledge of multiple disciplines and cutting-edge tools like supercooling and antimatter beams. Caroline Delbert, Popular Mechanics, "Physicist Believes He Has What It Takes to Make a Gamma Ray Laser," 9 Dec. 2019 Like many hibernating insects, overwintering mosquitoes depend on supercooling, a process by which an animal has the ability to rid its body fluids of impurities that would trigger the formation of ice. Ned Rozell, Anchorage Daily News, "Only female mosquitoes bother us (and other facts about the insects Alaskans love to hate)," 7 July 2018 The key is supercooling magnetized molecules to minus 351 degrees Fahrenheit. Lacy Schley, Discover Magazine, "Degrees of Separation," 10 Nov. 2017 Recent Examples on the Web: Adjective Like Pfizer's Covid-19 candidate, one of the Ebola vaccines requires supercool temperatures in transit. NBC News, "Creating a Covid-19 vaccine is only the first step. Reaching the world is the next.," 24 Nov. 2020 To help accommodate the extra refrigeration requirement, Pfizer has developed a supercool storage unit packed with dry ice. NBC News, "Pfizer has applied for emergency use for its Covid-19 vaccine," 20 Nov. 2020 Full of insulation that will keep you toasty, whether bingeing Netflix inside or sitting fireside outside, the weather-resistant, water-repellant blankets come in a variety of supercool patterns too. Courtney Thompson, CNN Underscored, "The snuggliest blankets to wrap yourself up in this year," 5 Nov. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'supercool.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of supercool


1904, in the meaning defined at transitive sense


1962, in the meaning defined above

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Time Traveler for supercool

Time Traveler

The first known use of supercool was in 1904

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Cite this Entry

“Supercool.” Dictionary, Merriam-Webster, Accessed 24 Feb. 2021.

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