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(def 2).
a vesicle or sac containing air.
Also called gas bladder, swim bladder. Ichthyology. a gas-filled sac located against the roof of the body cavity of most bony fishes, originally functioning only as a lung, now serving in many higher fishes to regulate hydrostatic pressure.
(ichthyol) Also called swim bladder. an air-filled sac, lying above the alimentary canal in bony fishes, that regulates buoyancy at different depths by a variation in the pressure of the air
any air-filled sac, such as one of the bladders of seaweeds
air bladder


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