# periderm

> English word · Noun

## Definitions
1. The outer layer of plant tissue comprising the phellem, phellogen and the phelloderm.
2. The perisarc; the hard outer layer of hydroids and other marine animals.

## Etymology
From peri- + -derm.

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