slippery elm

  1. a wide-branching North American elm (Ulmus rubra) with fragrant, mucilaginous inner bark and hard wood
  2. the wood or bark

See slippery elm in American Heritage Dictionary 4

noun
  1. A deciduous eastern North American tree (Ulmus rubra) having hard wood and mucilaginous, aromatic inner bark formerly used medicinally.
  2. The wood of this tree.
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