mountain ash

WordReference Random House Unabridged Dictionary of American English © 2026

moun′tain ash′, 

1. Plant Biology any of several small trees of the genus Sorbus, of the rose family, having flat-topped clusters of small, white flowers and bright-red to orange berries.
2. Plant Biology any of certain other trees, as several Australian species of eucalyptus.
• 1590–1600

Collins Concise English Dictionary © HarperCollins Publishers::

mountain ash noun

1. any of various trees of the rosaceous genus Sorbus, such as S aucuparia (European mountain ash or rowan), having clusters of small white flowers and bright red berries
2. any of several Australian eucalyptus trees, such as Eucalyptus regnans