Bladder

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.

Any vesicle or blister, especially if filled with air, or a thin, watery fluid.

A distended, membranaceous pericarp.

Anything inflated, empty, or unsound.

To swell out like a bladder with air; to inflate.

To put up in bladders; as, bladdered lard.

a distensible membranous sac (usually containing liquid or gas)