thermos

noun

ther·​mos ˈthər-məs How to pronounce thermos (audio)
: 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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The Grosche Stella moka pot comes in an ultra sleek four-cup size stainless steel vessel that embodies something like a thermos. Yelena Moroz Alpert, Architectural Digest, 10 Oct. 2025 Lawrence accessorized with a statement ring and leather flats, carrying a thermos in her hand and another beverage container in her black suede tote bag. Elizabeth Logan, Glamour, 7 Oct. 2025 Our lunch, a thermos of hot coffee, binoculars, a spotting scope, and two cameras jounced on the seat between us. Robert Merchant, Outdoor Life, 1 Oct. 2025 Some visitors come just to walk the bluff trails, scan the water for whales, or sit on the beach with a thermos and a dog. Lauren Mowery, Forbes.com, 8 Sep. 2025 See All Example Sentences for thermos

Word History

Etymology

from Thermos, a trademark

First Known Use

1907, in the meaning defined above

Time Traveler
The first known use of thermos was in 1907

Browse Nearby Words

Cite this Entry

“Thermos.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/thermos. Accessed 17 Oct. 2025.

Kids Definition

thermos

noun
ther·​mos ˈthər-məs How to pronounce thermos (audio)
: a container (as a bottle) with a vacuum between an inner and an outer wall used to keep material (as liquids) hot or cold

More from Merriam-Webster on thermos

Last Updated: - Updated example sentences
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