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1. (n.) air bladder
a vesicle or sac containing air.
2. air bladder
an air-filled sac at the top of the body cavity in bony fishes, serving in most to regulate hydrostatic pressure.
Etymology: (1725–35)
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| Definition of 'air bladder' |
Princeton's WordNet |
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1. (noun) air bladder, swim bladder, float
an air-filled sac near the spinal column in many fishes that helps maintain buoyancy
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| Definition of 'air bladder' |
Webster Dictionary |
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1. air bladder
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
2. air bladder
a sac or bladder full of air in an animal or plant; also an air hole in a casting
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Definitions of air bladder 
