PERIDERM
Source: 567
Per″i‐derm (?), n. 1. 1. (Bot.) The outer layer of bark.
2. 2. (Zoöl.) The hard outer covering of hydroids and other marine animals; the perisarc.
Source: 567
Per″i‐derm (?), n. 1. 1. (Bot.) The outer layer of bark.
2. 2. (Zoöl.) The hard outer covering of hydroids and other marine animals; the perisarc.