ther·​mos | \ ˈthər-məs How to pronounce thermos (audio) \

Definition of thermos

: 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

Photo: Nona Lim Campbell launched its drinkable soups after researchers noticed that parents sometimes poured soup into thermos containers to drink in their cars or microwaved it in mugs while working from home. Anne Marie Chaker, WSJ, "Put Down That Spoon—This Soup Is For Drinking," 5 Jan. 2019 This tough thermos was a champ at keeping liquid warm for hours in our tests. Betty Gold, Good Housekeeping, "The Best Travel Coffee Mugs That Won't Leak or Spill," 6 Mar. 2018 For always-ready hot chocolate or coffee, pack a double-wall vacuum insulated thermos with a leakproof lid. Clint Carter, WSJ, "Never Camped in the Snow? You’re Missing Out.," 11 Dec. 2018 Class schedule in one hand and a warm thermos of coffee in the other. Katelyn Chef, Teen Vogue, "Best Thermoses and Tumblers for Back to School," 10 Aug. 2018 Also, merch is normal for high-end automakers — BMW sells hats, thermoses, luggage, and… $61 golf balls. Elizabeth Lopatto, The Verge, "Elon Musk’s Teslaquila is actually a good idea," 19 Oct. 2018 By the time she was finished, Clarkson's jacket ended up on stage, too, as well as one of Levine's sneakers and Shelton's thermos. Temi Adebowale, Country Living, "SandyRedd’s Explosive Audition on ‘The Voice’ Will Go Down in the Show’s History," 3 Oct. 2018 At least three sets of mate gourds and thermoses sat untouched on the coffee table. Candace Rose Rardon, Longreads, "The Country Where Fútbol Comes First," 10 July 2018 And one of the walk-up food locations is a lunch pail that’s been propped up with a giant thermos. Mekado Murphy, New York Times, "Walk Among Giants — Woody Included — at Disney World's New Toy Story Land," 28 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'thermos.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of thermos

1907, in the meaning defined above

History and Etymology for thermos

from Thermos, a trademark

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Statistics for thermos

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Time Traveler for thermos

The first known use of thermos was in 1907

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More Definitions for thermos



English Language Learners Definition of thermos

: a container that keeps liquids hot or cold for long periods of time


ther·​mos | \ ˈthər-məs How to pronounce thermos (audio) \

Kids Definition of thermos

: a container (as a bottle or jar) that has a vacuum between an inner and an outer wall and is used to keep liquids hot or cold for several hours

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More from Merriam-Webster on thermos

Rhyming Dictionary: Words that rhyme with thermos

Spanish Central: Translation of thermos

Nglish: Translation of thermos for Spanish Speakers

Comments on thermos

What made you want to look up thermos? Please tell us where you read or heard it (including the quote, if possible).


one that collects or salvages junk

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