1. (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.

2. (n.) Any vesicle or blister, especially if filled with air, or a thin, watery fluid.

3. (n.) A distended, membranaceous pericarp.

4. (n.) Anything inflated, empty, or unsound.

5. (v. t.) To swell out like a bladder with air; to inflate.

6. (v. t.) To put up in bladders; as, bladdered lard.

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