1. rock elm(n = noun.plant) ulmus thomasii - tall widely distributed elm of eastern North America;
is a kind of elm, elm tree
is a member of genus ulmus, ulmus
2. rock elm(n = noun.plant) american elm, ulmus americana, water elm, white elm - large ornamental tree with graceful gradually spreading branches common in eastern North America;
is a kind of elm, elm tree
is a member of genus ulmus, ulmus
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