withy (n.) Look up withy at Dictionary.com
Old English wiðig "willow, willow twig," from Proto-Germanic *with- "willow" (source also of Old Norse viðir, Danish vidje, Swedish vide, Old High German wida, German Weide "willow"), from PIE root *wei- (1) "to bend, twist" (source also of Avestan vaeiti- "osier," Greek itea "willow," Latin vitis "vine," Lithuanian vytis "willow twig," Polish witwa, Welsh gwden "willow," Russian vitvina "branch, bough").