# thickness

> English word · Noun · IPA /ˈθɪknəs/ · frequency rank #10,464

## Definitions
1. The property of being thick (in dimension).
2. A measure of how thick (in dimension) something is.
3. A layer.
4. The quality of being thick (in consistency).
5. The property of being thick (slow to understand).
6. The minimum number of planar subgraphs which a given graph can decompose into.

## Etymology
From Middle English thikkenesse, thiknesse, from Old English þicnes (“thickness, viscosity, density, hardness; obscurity, cloud, darkness; thicket; depth, a thick body, anything thick or heavy”), from Proto-West Germanic *þikkwīnassī (“thickness”), equivalent to thick + -ness. Cognate with West Frisian tsjokkens (“thickness”), Old High German dickinessī, dikkinissi, diknissi (“thickness, density”). Eclipsed non-native Middle English crassitude (“thickness”) from Latin crassitūdō (“thickness”).

## Common misspellings (13)
`htickness`, `thcikness`, `thhickness`, `thicckness`, `thickenss`, `thickkness`, `thicknes`, `thicknness`, `thicknses`, `thicnkess`, `thikcness`, `tihckness`, `tthickness`

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