Etymology
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rowan (n.)

"mountain ash," 1804, from rowan-tree, rountree (1540s), rawntre (late 15c.), northern English and Scottish, from a Scandinavian source (compare Old Norse reynir, Swedish Ronn "the rowan"), said in Watkins to be ultimately from PIE root *reudh- "red, ruddy," in reference to the berries.

There were those in this neighbourhood, long after the beginning of the present century, who believed that a slip of rowan tree carried on their person dispelled glamour, and rendered nugatory all the powers of sorcery and witchcraft. [Alexander Laing, "Lindores Abbey and the Burgh of Newburgh," Edinburgh, 1876]

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Definitions of rowan

rowan (n.)
Eurasian tree with orange-red berrylike fruits;
Synonyms: rowan tree / European mountain ash / Sorbus aucuparia
From wordnet.princeton.edu