闭锁bìsuǒ 1.自然科学上指某个系统与外界隔绝,不相联系。{(of a system in natural sciences) close off; block; isolate from and lose contact with the external world} 2.医学上旧指瓣膜等严密合拢{(med.) (former usage) valvular sufficiency; tight closure of valve, etc.}: 大动脉~不全。{The major artery lacks valvular sufficiency.}