: a container (such as a bottle or jar) with a vacuum between an inner and outer wall used to keep material and especially liquids either hot or cold for considerable periods
Examples of thermos in a Sentence
Recent Examples on the Web
Williams unpacked a thermos and served us a hot—and very sweet—drink made from black-currant syrup.
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Akash Kapur, Travel + Leisure, 24 Feb. 2025
Inside the sub, researchers discovered a metal lunchbox packed with apples, thermoses of beef bouillon, and six bologna sandwiches, all remarkably well-preserved.
—Popular Science Team, Popular Science, 26 Feb. 2025
Bring plenty of warm clothing and, ideally, a thermos of hot tea or cocoa.
—Cindy Hirschfeld, New York Times, 20 Feb. 2025
Dončić filled a thermos with lemonade and sweet tea.
—C. Clark, M. Vorkunov and F. Katz, The Athletic, 17 Feb. 2025
See All Example Sentences for thermos
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Akash Kapur, Travel + Leisure, 24 Feb. 2025
Inside the sub, researchers discovered a metal lunchbox packed with apples, thermoses of beef bouillon, and six bologna sandwiches, all remarkably well-preserved.
—Popular Science Team, Popular Science, 26 Feb. 2025
Bring plenty of warm clothing and, ideally, a thermos of hot tea or cocoa.
—Cindy Hirschfeld, New York Times, 20 Feb. 2025
Dončić filled a thermos with lemonade and sweet tea.
—C. Clark, M. Vorkunov and F. Katz, The Athletic, 17 Feb. 2025
See All Example Sentences for thermos
Cite this Entry
“Thermos.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/thermos. Accessed 4 Apr. 2025.
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thermos
noun
ther·mos
ˈthər-məs 
: a container (as a bottle) with a vacuum between an inner and an outer wall used to keep material (as liquids) hot or cold
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