Ursan.[天]大熊星座；[天]小熊星座Urn.铀Ur archaeological site乌尔考古遗址Uromyces tripogonicolan.草沙蚕生单胞锈菌Uromyces baeumlerianusn.博伊姆勒单胞锈菌urosemiology apparatus尿液测试设备, 尿诊断仪器uraniferous waste rock含铀废石urachal adenocarcinoma脐尿管腺癌Urginea maritima Baker[医] 海葱Uranotaenia nivipleuran.白胸蓝带蚊Uromyces aecidiiformisn.春孢器状单胞锈菌Uranotaenia novobscuran.新糊蓝带蚊