# jefferisite

> English word · Noun

## Definitions
1. A kind of vermiculite.

## Etymology
Jefferis + -ite, after William W. Jefferis.

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