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dewar

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Dewar¹

  • /ˈdjuːwə(ɹ)/ UK

Where it comes from

From Scottish Gaelic deòradh (“pilgrim, stranger”), an occupational surname for a custodian of holy relics. It could also be an habitational surname, from Dewar, Scottish Borders. The flask is named for James Dewar, who is credited with its invention.

proper noun Dewars

  1. countable, uncountable A surname from Scottish Gaelic.
  2. countable, uncountable An unincorporated community in Black Hawk County, Iowa, United States.
  3. countable, uncountable A city in Okmulgee County, Oklahoma, United States.

noun Dewars · dewar

  1. A glass or metal double-walled flask for holding a liquid without much loss or gain of heat; a vacuum bottle or thermos. Generally used for scientific purposes and in particular for cryogenic work.

    Similar: Dewar bottle, Dewar bulb, Dewar flask, Dewar vessel

dewar²

  • /ˈdjuː.ə/ UK
  • /ˈduː.ɚ/ US

Sounds like doer (yod-dropping)

Where it comes from

Named after British physicist and chemist James Dewar, its inventor.

noun dewars · Dewar

  1. A vacuum flask; a vessel which keeps its contents hotter or cooler than their environment without the need to modify the pressure, by interposing an evacuated region to provide thermal insulation between the contents and the environment. A large thermos-like container called a dewar contained 645 gallons of liquid helium to be cooled to within two degrees of absolute zero.

    Similar: Dewar bulb, Dewar flask, Dewar tube, Dewar vessel, vacuum flask, vacuum thermos, vacuum thermos bottle, vacuum thermos bulb, vacuum thermos flask, vacuum thermos vessel

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noun vacuum flask

中文保温瓶 bǎowēnpín

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MLA

"dewar." Wiktionary, via Micwyn, micwyn.com/word/dewar. Accessed 6 Nov. 2026.

APA

dewar. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/dewar

Chicago

"dewar." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/dewar.

BibTeX
@misc{dewar_2026,
  title = {dewar},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/dewar},
  urldate = {2026-11-06}
}