# tonic

> English word · Adjective · IPA /ˈtɒnɪk/ · frequency rank #17,507

## Definitions
1. Pertaining to tension, especially of the muscles.
2. Restorative; curative; or invigorating.
3. In a state of continuous unremitting action.

## Etymology
From Ancient Greek τονικός (tonikós), from τόνος (tónos). 17th century writers believed health to be derived from firmly stretched muscles, thus tonic; the extension of tonic medicine appeared in the late 18th century. By surface analysis, ton(e) + -ic.

## Easily confused with
- **Tony** (https://plainspell.com/en/vs/tonic-vs-tony)
- **tons** (https://plainspell.com/en/vs/tonic-vs-tons)
- **tori** (https://plainspell.com/en/vs/tonic-vs-tori)
- **tonk** (https://plainspell.com/en/vs/tonic-vs-tonk)
- **topic** (https://plainspell.com/en/vs/tonic-vs-topic)
- **toxic** (https://plainspell.com/en/vs/tonic-vs-toxic)
- **toxin** (https://plainspell.com/en/vs/tonic-vs-toxin)
- **tonne** (https://plainspell.com/en/vs/tonic-vs-tonne)
- **tunic** (https://plainspell.com/en/vs/tonic-vs-tunic)
- **Tunis** (https://plainspell.com/en/vs/tonic-vs-tunis)
- **Tonya** (https://plainspell.com/en/vs/tonic-vs-tonya)
- **tonto** (https://plainspell.com/en/vs/tonic-vs-tonto)
- **topics** (https://plainspell.com/en/vs/tonic-vs-topics)
- **tropic** (https://plainspell.com/en/vs/tonic-vs-tropic)
- **toning** (https://plainspell.com/en/vs/tonic-vs-toning)
- **Tonkin** (https://plainspell.com/en/vs/tonic-vs-tonkin)
- **ton** (https://plainspell.com/en/vs/ton-vs-tonic)
- **tic** (https://plainspell.com/en/vs/tic-vs-tonic)
- **TOI** (https://plainspell.com/en/vs/toi-vs-tonic)
- **ToC** (https://plainspell.com/en/vs/toc-vs-tonic)

## Common misspellings (7)
`otnic`, `tnoic`, `toinc`, `tonci`, `tonicc`, `tonnic`, `ttonic`

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