# trass

> English word · Noun · IPA /tɹɑːs/

## Definitions
1. A white to grey volcanic tufa, formed of decomposed trachytic cinders, sometimes used as a cement.
2. A coarse sort of plaster or mortar, durable in water, and used to line cisterns and other reservoirs of water.

## Etymology
From Dutch tras or German Trass, probably from Italian terrazzo (“terrace”). See terrace.

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