# rockwool

> English word · Noun

## Definitions
1. Inorganic material resembling fiber, used primarily for insulation and soundproofing.
2. A horticultural growing medium made from natural ingredients, usually including basalt rock and chalk.

## Etymology
From rock + wool.

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