phellemyoudaoicibaDictYouDict[phellem 词源字典]
"The outermost, protective layer of the periderm of plant shoots and roots, typically composed of tightly packed, suberized cells; cork tissue", Late 19th cent.; earliest use found in Proceedings of the Royal Society of London. From German Phellem from ancient Greek ϕελλός cork + German -em.[phellem etymology, phellem origin, 英语词源]