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