1. Any of various trees of the genus Sorbus
   "The mountain ash's bright red berries attracted a flock of waxwings"
    
2. [Austral] Tree having wood similar to the alpine ash; tallest tree in Australia and tallest hardwood in the world
   "The mountain ash towers over other trees in the forest";
   - Eucalyptus regnans

Derived forms: mountain ashes

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

Part of: genus Sorbus, Sorbus

Encyclopedia: Mountain ash