房室共通：一种先天性心脏畸形，其心内膜垫未融合，原中隔孔持续存在，房室未分隔，单一的房室瓣有前尖和后尖，室中隔膜有缺损- ulotomy
- ulotripsis
- ultimate
- ultimisternal
- ultimum moriens
- ult. praes
- ultra-
- ultrabrachycephalic
- ultracentrifugation
- ultracentrifuge
- ultradian
- ultradolichocephalic
- ultrafilter
- ultrafiltrate
- ultrafiltration
- ultragaseous
- ultramicrochemistry
- ultramicron
- ultramicropipet
- ultramicroscope
- ultramicroscopic
- ultramicroscopy
- ultramicrotome
- Ultran
- ultraphagocytosis