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
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