bladder
//ˈblæd.ər//
Noun
bladderSingular
bladdersPlural
1
A hollow muscular organ in the body that stores urine before it is excreted.
The doctor examined her bladder using an ultrasound.
2
A flexible bag or sac that can be inflated, especially one made from animal tissue or rubber.
The football's bladder needs to be inflated before the game.
3
An air-filled sac in certain plants or animals, such as seaweed or fish.
Fish use their bladders to control buoyancy in the water.