Search Dictionary
Definition of thermos

thermos

/ˈθɜːr.məs/
ther · mos
Plural:thermoses
JUMP TO:

thermos Lexical Profile

thermos Game Scores & Validity

• noun

1

A container that keeps a liquid hot or cold by means of a double wall enclosing a vacuum.

Example

"She poured a cup of hot coffee from her thermos to warm up on the chilly morning."

Synonyms
View all synonyms for thermos

Word Nuance & Usage

Though originally a registered trademark (Thermos), the term has become widely genericized in everyday English to refer to any brand of vacuum flask.

• Rhymes for thermos

• Nearby Words

thermocouple
thermometer
thermopsis
thermos
thermostat
thespesia
thessaloniki

Word Origin & Etymology

Coined as a trademark in 1904 by the German company Thermos GmbH, derived from the Greek word 'thermos', meaning 'hot'.

Cite this Entry

Wordmom. (2026). Definition of Thermos. In Wordmom Dictionary. Retrieved Oct 14, 2026, from https://wordmom.com/dictionary/thermos
Wordmom is your complete guide to the English language. Whether you're looking up a definition, searching for the perfect synonym, or unscrambling letters for a word game, our comprehensive suite of tools is designed to help you find the right word, every time.
Word Games & Solvers
Word FinderScrabble Word FinderWords With Friends CheatWordle SolverAnagram Solver
Dictionary & Reference
DictionarySynonymsAntonymsWords
Community
Contact UsEditorial PolicyPrivacy PolicyTerms and Conditions
© 2016–2026 Wordmom Network. All rights reserved. Made with for word lovers everywhere.
Disclaimer: SCRABBLE®, Words With Friends®, Wordle®, and related game titles or tournament codes are registered trademarks of their respective owners (including Hasbro, Mattel, Zynga, The New York Times, NASPA, and WESPA). Wordmom is an independent reference utility for educational and entertainment purposes, not affiliated with, sponsored, or endorsed by these entities. All game names are referenced strictly under nominative fair use for compatibility.