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

My guide was a delightful Cajun named Adler Cohen, and he was equipped with two huge thermoses of coffee (without which any Cajun is helpless) and a cheery disposition. —Nash Buckingham, Outdoor Life, 19 June 2025

They will also be entered to win additional prizes, like books, thermoses, e-readers and more. —Carly Tagen-Dye, People.com, 13 June 2025

Many South Americans carry a gourd, traditionally made of squash and bound in leather, in one hand, and a thermos of water in the other, pouring portions throughout the day, sipping through the metal bombilla straw. —Andrew Watman, Forbes.com, 1 May 2025

My guide, Louisa, pulls a thermos from her pack and begins pouring water into a tall, cylindrical cup filled with erva-mate leaves, or mate. —Will McGough, Forbes.com, 29 May 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