| 1. | Anatomy, Zoology.
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| 2. | Pathology. a vesicle, blister, cyst, etc., filled with fluid or air. |
| 3. | Botany. an air-filled sac or float, as in certain seaweeds. |
| 4. | something resembling a bladder, as the inflatable lining of a football or basketball. |
| 5. | an air-filled sac, usually made to resemble a club, used for beatings in low comedy, vaudeville, or the like. |

A stretchable saclike structure in the body that holds fluids. The term is used most often to refer to the urinary bladder, which is part of the excretory system. Another kind of bladder is the gallbladder.
bladder blad·der (blād'ər)
n.
Any of various distensible membranous sacs, such as the urinary bladder, that serve as receptacles for fluid or gas.
A blister, pustule, or cyst filled with fluid or air; vesicle.
bladder (blād'ər) Pronunciation Key
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