bladder
/ˈblædə(r)/noun
1
- a membranous sac in humans and other animals, in which urine is collected for excretion膀胱。
2
- anything inflated and hollow, in particular an inflated fruit or vesicle in various plants囊, 气囊, 气泡; （植物的）果实囊, 泡。
词源
Old English blǣdre, of Germanic origin; related to Dutch blaar and German Blatter, also to BLOW1.