(anatomy, usually of fish) A gas-filled sac within the bodies of most fish that variously acts as a float, lung, sound-producing organ or an aid to hearing.

plural of swim bladder

(ichthyology) An internal organ that fish use to control their buoyancy, allowing them to maintain or change depth by changing their density.

plural of gas bladder

An internal organ that fish use to control their buoyancy, allowing them to maintain or change depth by changing their density.

plural of air bladder

A bladder containing (real or fake) blood, used to fake someone's death or injury, as in espionage or confidence tricks where a person is made to think that he is an accessory to murder.

plural of gall bladder

A plant, Alkekengi officinarum (syn. Physalis alkekengi), having a bright paper-like covering over its fruit, native to southern Europe.

plural of bladder cherry