# rock glass

> English word · Noun

## Definitions
1. Metastable glass of volcanic or dyke origin.
2. Alternative form of rocks glass (“a short glass tumbler for serving liquor with ice”).

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