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

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

While Yeti is best known for its Ramblers and camping thermoses, the brand has a plastic bottle that maintains the same quality shoppers love about their metal products. —Anja Webb, Parents, 8 Aug. 2025

Chicken and potatoes can make a nice cold salad, or spoon pasta into a thermos for a hearty midday meal. —Laney Crawley, People.com, 1 Aug. 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