Pronunciation: (blad'ur), [key]
1. Anat., Zool.
a. a membranous sac or organ serving as a receptacle for a fluid or air.
b. See urinary bladder.
2. Pathol.a vesicle, blister, cyst, etc., filled with fluid or air.
3. Bot.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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.