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swim bladder --> air bladder

1. (Science: anatomy) 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 oesophagus.

2. A sac or bladder full of air in an animal or plant; also an air hole in a casting.