: 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
Bring a reusable thermos to your local coffee shop, which will keep your iced coffee cooler for longer while using less plastic, and pack your own utensils to avoid the plastic cutlery that comes with takeout.
—
Simmone Shah, Time, 27 May 2026
The building is wrapped in a super-insulated, airtight shell that acts like a high-quality thermos.
—Stefan Ionescu
may 12, New Atlas, 12 May 2026
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
See All Example Sentences for thermos
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Simmone Shah, Time, 27 May 2026
The building is wrapped in a super-insulated, airtight shell that acts like a high-quality thermos.
—Stefan Ionescu
may 12, New Atlas, 12 May 2026
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
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 Jun. 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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