U字母開頭的單詞或詞組(第19頁)：
- unauthorized use
- utilization logger system
- unwinding protein
- urogenital tuberculosis
- uncreated
- ultimately
- unicellular hair
- unspoilt
- unvouched
- unfaltering
- undelayed pulse
- up against
- undeliverable
- uniform apparent flow
- undue sentence
- uphold national unity and territorial integrity
- unattainable
- Uncinaria
- unaccepted
- undesirable
- underjawed
- unsaturated Weston cell
- up to the eyes
- undefinition
- unappropriated surplus
- uridine diphosphate glucose (UDPG)
- uriniparous tubules
- urocanic acid
- urethral cast
- unwritten code
- ush
- unifocal
- unrooted tree
- undeceive
- unsaturation
- union station
- universal donor
- upper memory block
- unilization ratio
- undertaking syndicate