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What is "periderm"

The Collaborative International Dictionary
Periderm

Periderm \Per"i*derm\, n.

  1. (Bot.) The outer layer of bark.

  2. (Zo["o]l.) The hard outer covering of hydroids and other marine animals; the perisarc.

Wiktionary
periderm

n. 1 (context botany English) The outer layer of plant tissue; the outer bark. 2 (context zoology English) The perisarc; the hard outer layer of hydroids and other marine animals.