phelloderm
/ˈfɛlədəːm/Botany
noun
The innermost layer of the periderm in some plants, composed of parenchymatous cells.
Origin
Late 19th century; earliest use found in Alfred Bennett (1833–1902), botanist and publisher. From German Phelloderm, alteration of Phelloderma from ancient Greek ϕελλός cork + δέρμα skin.