dew·​ar ˈdü-ər How to pronounce dewar (audio)
 also  ˈdyü-
often capitalized
: a glass or metal container made like a vacuum bottle that is used especially for storing liquefied gases

called also Dewar flask

Examples of dewar in a Sentence

Recent Examples on the Web Standard procedure is to put specimens into aluminum tanks called dewars, which contain liquid nitrogen. Tiffany Ap, Quartz, 20 Mar. 2023

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'dewar.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


Sir James Dewar

First Known Use

1939, in the meaning defined above

Time Traveler
The first known use of dewar was in 1939

Dictionary Entries Near dewar

Cite this Entry

“Dewar.” Dictionary, Merriam-Webster, Accessed 4 Dec. 2023.

Biographical Definition


biographical name

Dew·​ar ˈdü-ər How to pronounce Dewar (audio)
Sir James 1842–1923 Scottish chemist and physicist
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