placenta praevia
/ˈpriːvɪə/( <美> placenta previa)
noun
mass noun
- Medicine a condition in which the placenta partially or wholly blocks the neck of the uterus, so interfering with normal delivery of a baby【医】前置胎盘。
词源
early 19th cent.: from placenta and Latin praevia 'going before'， feminine of praevius.