# vermiculite

> English word · Noun · frequency rank #91,121

## Definitions
1. A hydrated silicate mineral which expands on heating; it is used in insulation and as a medium for planting.

## Etymology
From Latin vermiculus (“wormlet”), for its fibrous nature and tendency to expand into worm-like shapes when heated.

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