Definition of mountain ash in English:

mountain ash

Syllabification: moun·tain ash

noun

  • 1A small deciduous tree of the rose family, with compound leaves, white flowers, and red berries. Also called rowan.
    • Genus Sorbus, family Rosaceae: several species, in particular the North American S. americana
    More example sentences
    • These trees, including many varieties of crabapple, hawthorn, pear, mountain ash, flowering quince and pyracantha, should be pruned during the dormant season.
    • Many a Scots family planted mountain ash, a tree with brilliant red-orange berries, at its door to keep the witches and fairies away.
    • It's hard to think of autumn and winter berries without thinking of the mountain ash, or rowan tree.
  • 2Australian A eucalyptus tree that is widely used for timber.
    • Genus Eucalyptus, family Myrtaceae: several species, in particular the very tall E. regnans
    More example sentences
    • Now what about the tallest trees, because I believe the tallest one ever measured in Australia was a eucalyptus regnans, or a mountain ash, in Victoria.
    • David Lindenmeyer raises a very interesting point that the mountain ash forests in Australia, in Victoria and Tasmania, are the best carbon sinks of any forests in the world, which is quite interesting.
    • The Jurassic grandeur of the Otway National Park soon enfolded the road, the car, and much of the daylight, within a leafy tunnel of mountain ash, gum, beech and ferns.

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a slit made by cutting with a saw