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Definition of thermos

thermos

/ˈθɜːr.məs/
ther · mos
Plural:thermoses
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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

thermometer
thermonuclear
thermopsis
thermos
thermostat
thermostatic
thermostatically

Word Origin & Etymology

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

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

Wordmom. (2026). Definition of Thermos. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/thermos
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