[Corrupted from Du. huizenblas, the bladder of the sturgeon.] A substance consisting chiefly of gelatine, prepared from the sounds or air bladders of certain freshwater fishes. The finest is obtained from the sturgeon, which is very plentiful in the Caspian and Black seas and the rivers flowing into them ; but isinglass is also made from the bladders of the cod and other fish, and quantities are produced in Brazil, North America, and the East Indies. It is much used in making jellies, ices and other kind of desserts, and in clarifying beer. It is the chief substance of Russian glue, noted for its strength, and used in stiffening linens, silks, gauzes, etc. Isinglass dissolved in acetic acid is a useful cement for repairing glass, pottery, etc.