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| air blad·der (plural air blad·ders) |
noun |
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| Definition: |
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1. fish's buoyancy organ: an air-filled sac above the alimentary canal in most fishes that regulates buoyancy and, in some, aids in respiration
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2. air-filled sac in seaweed: an air-filled sac that aids buoyancy in some types of seaweed
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