# clinker

> English word · Noun · IPA /ˈklɪŋkə(ɹ)/ · frequency rank #58,600

## Definitions
1. A very hard brick used for paving customarily made in the Netherlands.
2. A mass of bricks fused together by intense heat.
3. Slag or ash produced by intense heat in a furnace, kiln or boiler that forms a hard residue upon cooling.
4. An intermediate product in the manufacture of Portland cement, obtained by sintering limestone and alumino-silicate materials such as clay into nodules in a cement kiln.
5. Hardened volcanic lava.
6. A scum of oxide of iron formed in forging.

## Etymology
From Dutch klinkaerd, later klinker, from klinken (“to ring, resound”).

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