thermos

noun

ther·​mos ˈthər-məs 

: 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

At the risk of indulging in a sort of giddy hyperbole, pretty much every NHL playoff game feels like watching Uncut Gems after drinking a thermos of espresso. —Anthony Crupi, Sportico.com, 18 Apr. 2025

This comforting combination is especially popular among hikers and skiers, where a thermos of coffee and a waffle topped with brown cheese is a classic mountain snack. —David Nikel, Forbes.com, 5 Apr. 2025

Williams unpacked a thermos and served us a hot—and very sweet—drink made from black-currant syrup. —Akash Kapur, Travel + Leisure, 24 Feb. 2025

Inside the sub, researchers discovered a metal lunchbox packed with apples, thermoses of beef bouillon, and six bologna sandwiches, all remarkably well-preserved. —Popular Science Team, Popular Science, 26 Feb. 2025

Word History

Etymology

from Thermos, a trademark

First Known Use

1907, in the meaning defined above

Rhymes for thermos

• dermis
• vermis
• endodermis
• epidermis
• hypodermis

Kids 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