a two-chambered gas-filled sac that is present in most fish and functions as a hydrostatic organ; it is located beneath the vertebral column, and is connected with the esophagus in some fish. Syn: swim bladder.
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a two-chambered gas-filled sac that is present in most fish and functions as a hydrostatic organ; it is located beneath the vertebral column, and is connected with the esophagus in some fish. Syn: swim bladder.