: 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
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
Some of the hikers went back into the blizzard with the stretcher, sleeping bags, warm thermoses, and an Automated External Defibrillator (AED) to rescue those left behind.
—Madison Dapcevich, Outside, 24 Dec. 2025
When severe turbulence heightens her fear of flying, the man sitting beside her offers his thermos, filled with vodka and watermelon juice.
—Samantha Stutsman, PEOPLE, 21 Dec. 2025
See All Example Sentences for thermos
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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
Some of the hikers went back into the blizzard with the stretcher, sleeping bags, warm thermoses, and an Automated External Defibrillator (AED) to rescue those left behind.
—Madison Dapcevich, Outside, 24 Dec. 2025
When severe turbulence heightens her fear of flying, the man sitting beside her offers his thermos, filled with vodka and watermelon juice.
—Samantha Stutsman, PEOPLE, 21 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 3 Apr. 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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