Rhytidome vs. Periderm
Rhytidomenoun
(botany) The dead layers of plant bark (undergoing or having undergone secondary growth) external to that of the last formed periderm [http://i.word.com/idictionary/rhytidome].
Peridermnoun
(botany) The outer layer of plant tissue comprising the phellem, phellogen and the phelloderm.
Peridermnoun
(zoology) The perisarc; the hard outer layer of hydroids and other marine animals.
Peridermnoun
The outer layer of bark.
Peridermnoun
The hard outer covering of hydroids and other marine animals; the perisarc.
