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air bladder an air-filled sac in various animals and plants, esp. such a structure located near the spine of certain fish that functions to maintain buoyancy by regulating hydrostatic pressure. (See swim bladder.)
gallbladder a small muscular sac that is attached to the liver and that stores bile.
swim bladder an inflated sac that extends lengthwise against the upper side of the body cavity of most bony fishes, its purpose being to regulate hydrostatic pressure.