Noun mountain ash has 3 senses
  1. mountain ash - any of various trees of the genus Sorbus
    --1 is a kind of
    angiospermous tree, flowering tree
    --1 is a member of Sorbus, genus Sorbus
    --1 has particulars:
     rowan, rowan tree, European mountain ash, Sorbus aucuparia; American mountain ash, Sorbus americana; Western mountain ash, Sorbus sitchensis; service tree, sorb apple, sorb apple tree, Sorbus domestica
  2. mountain ash, Eucalyptus regnans - tree having wood similar to the alpine ash; tallest tree in Australia and tallest hardwood in the world
    --2 is a kind of eucalyptus, eucalypt, eucalyptus tree
  3. mountain ash, Fraxinus texensis - low-growing ash of Texas
    --3 is a kind of ash, ash tree
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