Mountain ash Meaning, Definition & Usage

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

WordNet

Definitions
  1. . See Roman tree, and under Mountain.
Definitions
  1. (Bot.), an ornamental tree, the Pyrus (Sorbus) Americana, producing beautiful bunches of red berries. Its leaves are pinnate, and its flowers white, growing in fragrant clusters. The European species is the P. aucuparia, or rowan tree.
  2. . See Roman tree, and under Mountain.

Webster 1913