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.
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See Sacs.
Open English WordNet identifies the related term as a broader lexical category for at least one sense.
Anything which floats or rests on the surface of a fluid, as to sustain weight, or to indicate the height of the surface, or mark the place of, somet…
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