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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.

A sort of Russian isinglass, made from the air bladder of the sturgeon, and used in clarifying wine.

Capable of contraction. Small air bladders distable and contractible. Arbuthnot.

a Ceratodus and Lepidosiren, which present the closest approximation to the Amphibia. The air bladder acts as a lung, and the nostrils open inside the mouth. See Ceratodus, and Illustration in Appendix.

any fish of the family Sciænidæ, which makes a loud noise by means of its air bladder; -- called also drum.

itransparent, whitish, and very pure from of gelatin, chiefly prepared from the sounds or air bladders of various species of sturgeons (as the Acipenser huso) found in the of Western Russia. It used for making jellies, as a clarifier, etc. Cheaper forms of gelatin are not unfrequently so called. Called also fish glue.…

An order of teleost in which the air bladder has no opening.

An order of fishes in which the air bladder is provided with a duct, and the ventral fins, when present, are abdominal. It includes the salmons, herrings, carps, catfishes, and others.

Having a duct to the air bladder.

The air bladder of a fish; as, cod sounds are an esteemed article of food.

North America, Europe, and Asia. Caviare is prepared from the roe, and isinglass from the air bladder.

The sound, or air bladder, of a fish.