: 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
Dončić filled a thermos with lemonade and sweet tea.
—
C. Clark, M. Vorkunov and F. Katz, The Athletic, 17 Feb. 2025
As a reviewer of oft-frivolous things, I'm impressed by still-functioning, ancient items like cast iron pans, insulated thermoses, and hundred-year-old sewing machines.
—Parker Hall, WIRED, 15 Oct. 2020
Lionel Messi and Luis Suarez carry it around in thermoses.
—Michelle Kaufman, Miami Herald, 15 Jan. 2025
The wide-mouth thermos is easy to pour into and has an 8-ounce lid that can be used as a cup.
—Chaunie Brusie, Rn, Parents, 29 Nov. 2024
See All Example Sentences for thermos
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C. Clark, M. Vorkunov and F. Katz, The Athletic, 17 Feb. 2025
As a reviewer of oft-frivolous things, I'm impressed by still-functioning, ancient items like cast iron pans, insulated thermoses, and hundred-year-old sewing machines.
—Parker Hall, WIRED, 15 Oct. 2020
Lionel Messi and Luis Suarez carry it around in thermoses.
—Michelle Kaufman, Miami Herald, 15 Jan. 2025
The wide-mouth thermos is easy to pour into and has an 8-ounce lid that can be used as a cup.
—Chaunie Brusie, Rn, Parents, 29 Nov. 2024
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 Mar. 2025.
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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