PERIDERM

periderm (plural periderms)

(botany) The outer layer of plant tissue comprising the phellem, phellogen and the phelloderm.

(zoology) The perisarc; the hard outer layer of hydroids and other marine animals.

• reprimed

Source: Wiktionary

Per"i*derm, n.

1. (Bot.)

Definition: The outer layer of bark.

2. (Zoöl.)

Definition: The hard outer covering of hydroids and other marine animals; the perisarc.

Source: Webster’s Unabridged Dictionary 1913 Edition

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17 May 2025

(noun) sessile marine coelenterates including solitary and colonial polyps; the medusoid phase is entirely suppressed

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