noun Botany.
a layer of parenchyma produced inwardly by the cork cambium; an inner secondary cortex of the cork cambium.

phellodermal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
phelloderm (ˈfɛləʊˌdɜːm)
a layer of thin-walled cells produced by the inner surface of the cork cambium
[C19: from Greek phellos cork + -derm]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
phelloderm   (fěl'ə-dûrm')  Pronunciation Key 
The layer of tissue, often very thin, produced on the inside of the cork cambium in woody plants. It forms a secondary cortex. See more at cork cambium.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Phelloderm cells, to the inside of the phellogen may be thickened or expanded.
Potato periderm consists of three different cell types: phellem, phellogen, and phelloderm.
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