slippery elm
noun
1- a North American elm with coarsely textured leaves and rough outer bark（北美）糙枝榆, 红榆, 滑榆。
1.1
- Ulmus fulva, family Ulmaceae.拉丁名Ulmus fulva,榆科。
1.2
- mass noun the mucilaginous inner bark of this tree used medicinally（药用）榆树黏质内皮, 红榆皮。