ˈepəˌblem noun
or ep·i·ble·ma ˌepəˈblēmə
( -s )
Etymology: New Latin epiblema, from Greek epiblēma covering, from epi- + blēma throw, coverlet, from ballein to throw — more at devil
: the superficial layer of tissue replacing the true epidermis in most roots and in stems of submerged aquatics