Entry 2 senses · 2 variants Webster, 1913 Uro- · U·ro- · IPA /ˈjʊəɹə(ʊ)-/ 01 A combining form fr. Gr. o'y^ron, urine. 1. A combining form fr. Gr. o'y^ron, urine. 02 A combining form from Gr. o'yra`, the tail, the caudal extremity. 1. A combining form from Gr. o'yra`, the tail, the caudal extremity.