Bladder

1. n. Anything inflated, empty, or unsound.
2. n. A bag or sac in animals, which serves as the receptacle of some fluid; as, the urinary bladder; the gall bladder; — applied especially to the urinary bladder, either within the animal, or when taken out and inflated with air.
3. n. Any vesicle or blister, especially if filled with air, or a thin, watery fluid.
4. n. A distended, membranaceous pericarp.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.