: 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
Coffee arrived at my door in a Yeti thermos.
—
Stacey Leasca, Travel + Leisure, 2 May 2026
These sound like guys who show up with a thermos, and a sandwich wrapped in wax paper.
—Mark Glende, Twin Cities, 3 Apr. 2026
In September, when the weather turned cold early and the pipes froze, Krogh personally delivered thermoses of hot water to each tent — enough for each guest to wash their face.
—Tribune News Service, Baltimore Sun, 16 Mar. 2026
Lisbeth’s sister, who was pregnant, sat in the front seat, holding a large thermos filled with coffee.
—Jordan Salama, New Yorker, 30 Dec. 2025
See All Example Sentences for thermos
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Stacey Leasca, Travel + Leisure, 2 May 2026
These sound like guys who show up with a thermos, and a sandwich wrapped in wax paper.
—Mark Glende, Twin Cities, 3 Apr. 2026
In September, when the weather turned cold early and the pipes froze, Krogh personally delivered thermoses of hot water to each tent — enough for each guest to wash their face.
—Tribune News Service, Baltimore Sun, 16 Mar. 2026
Lisbeth’s sister, who was pregnant, sat in the front seat, holding a large thermos filled with coffee.
—Jordan Salama, New Yorker, 30 Dec. 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 6 May. 2026.
Copy CitationKids Definition
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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