ˈrid.əˌdōm noun
( -s )
Etymology: probably from (assumed) New Latin rhytidoma, from Greek rhytidōma wrinkle, from rhytidoun to wrinkle, from rhytid-, rhytis wrinkle; perhaps akin to Greek eryein to drag, draw, Latin rudent-, rudens ship's rope
: the part of the bark external to the last formed periderm — called also scale bark, shell bark