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Definition of Swim bladder
1. Noun. An air-filled sac near the spinal column in many fishes that helps maintain buoyancy.
Definition of Swim bladder
1. Noun. (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. ¹
¹ Source: wiktionary.com