Definition of "mountain ash" []

• Any of various deciduous trees of the genus Sorbus, such as the rowan, having clusters of small white flowers and bright orange-red berries arranged in clusters. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.