Noun rock elm has 2 senses
  1. rock elm, Ulmus thomasii - tall widely distributed elm of eastern North America
    --1 is a kind of elm, elm tree
    --1 is a member of Ulmus, genus Ulmus
  2. American elm, white elm, water elm, rock elm, Ulmus americana - large ornamental tree with graceful gradually spreading branches common in eastern North America
    --2 is a kind of elm, elm tree
    --2 is a member of Ulmus, genus Ulmus
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