# thermos

> English word · Noun · IPA /ˈθɜː.mɒs/ · frequency rank #44,527

## Definitions
1. A bottle, flask or similar vessel having a vacuum between its inner and outer silvered walls; designed to maintain the temperature of its contents

## Etymology
Genericization of the trademark Thermos, from Ancient Greek θερμός (thermós, “warm”). Possibly related to English warm.

## Easily confused with
- **Theron** (https://plainspell.com/en/vs/thermos-vs-theron)
- **terms** (https://plainspell.com/en/vs/terms-vs-thermos)
- **theres** (https://plainspell.com/en/vs/theres-vs-thermos)
- **there's** (https://plainspell.com/en/vs/there-s-vs-thermos)
- **thermal** (https://plainspell.com/en/vs/thermal-vs-thermos)
- **thereof** (https://plainspell.com/en/vs/thereof-vs-thermos)
- **thereon** (https://plainspell.com/en/vs/thereon-vs-thermos)

## Common misspellings (11)
`htermos`, `tehrmos`, `themros`, `thermmos`, `thermoss`, `thermso`, `theroms`, `therrmos`, `thhermos`, `thremos`, `tthermos`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/thermos