Definitions for air bladder
Random House Webster's College Dictionary
a vesicle or sac containing air.
an air-filled sac at the top of the body cavity in bony fishes, serving in most to regulate hydrostatic pressure.
Ref: Also called swim bladder.
Origin of air bladder:
air bladder, swim bladder, float(noun)
an air-filled sac near the spinal column in many fishes that helps maintain buoyancy
An internal organ that fish use to control their buoyancy, allowing them to maintain or change depth by changing their density.
an air sac, sometimes double or variously lobed, in the visceral cavity of many fishes. It originates in the same way as the lungs of air-breathing vertebrates, and in the adult may retain a tubular connection with the pharynx or esophagus
a sac or bladder full of air in an animal or plant; also an air hole in a casting