# peristome

> English word · Noun

## Definitions
1. One or two rings of tooth-like appendages surrounding the opening of the capsule of many mosses.
2. The parts of or surrounding the mouths of numerous invertebrates.
3. The lip, or edge of the aperture, of a spiral shell.

## Etymology
From peri- + -stome.

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