see witch hazel.
Online Etymology Dictionary, © 2010 Douglas Harper
Examples from the Web for wych
The summer of 1914 was noted for a similar abundance of seed on the wych elm.Trees. A Woodland Notebook
The broad-leaved or wych elm (Ulmus montana), indigenous to Scotland.The Lady of the Lake
Sir Walter Scott
No good, it was long supposed, could ever come out of Wych Street.
The Wych Elm is a native of our country, and is also very common, but it occurs principally in the woods of the North.Field and Woodland Plants
William S. Furneaux
The philologists appear to be uncertain as to the origin and meaning of Wych, but it seems most probably a form of Witch.Wayside and Woodland Trees