The American Heritage® Dictionary of the English Language, 4th Edition
n. A small deciduous European tree (Sorbus aucuparia) of the rose family, having pinnately compound leaves, corymbs of white flowers, and orange-red berries.
n. Any of various small deciduous trees or shrubs of genus Sorbus, belonging to the rose family, with pinnate leaves, corymbs of white flowers, and usually with orange-red berries.
the GNU version of the Collaborative International Dictionary of English
n. Rowan tree.
The Century Dictionary and Cyclopedia
n. The rowan-tree.
n. The fruit or berry of the rowan-tree.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. Eurasian tree with orange-red berrylike fruits
Word Usage
"Apparently, 'rowan' is simply a somewhat dated synonym of 'mountain ash'."