- Anatomy, Zoology.
- a membranous sac or organ serving as a receptacle for a fluid or air.
- urinary bladder.
- a vesicle, blister, cyst, etc., filled with fluid or air.
- an air-filled sac or float, as in certain seaweeds.
- something resembling a bladder, as the inflatable lining of a football or basketball.
- an air-filled sac, usually made to resemble a club, used for beatings in low comedy, vaudeville, or the like.
- a distensible membranous sac, usually containing liquid or gas, esp the urinary bladder
- an inflatable part of something
- a blister, cyst, vesicle, etc, usually filled with fluid
- a hollow vesicular or saclike part or organ in certain plants, such as the bladderwort or bladderwrack
