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1. Any of various trees of the genus Sorbus
    
2. Tree having wood similar to the alpine ash; tallest tree in Australia and tallest hardwood in the world
   - Eucalyptus regnans
    
3. Low-growing ash of Texas
   - Fraxinus texensis

Derived forms: mountain ashes

Type of: angiospermous tree, ash, ash tree, eucalypt, eucalyptus, eucalyptus tree, flowering tree

Part of: genus Sorbus, Sorbus

Encyclopedia: Mountain ash