Entry 1 sense Webster, 1913 Xylo- /zīʹ-lō/ · Xy·lo- · IPA /ˈzaɪ.loʊ/ 01 A combining form from Gr. xy`lon wood; as in xylogen, xylograph. 1. A combining form from Gr. xy`lon wood; as in xylogen, xylograph.