air bladder

[air blad-er]

noun

1. a vesicle or sac containing air.

2. Also called swim bladder. Also called gas bladder,. Ichthyology.,  a gas-filled sac located against the roof of the body cavity of most bony fishes, originally functioning only as a lung, now serving in many higher fishes to regulate hydrostatic pressure.

air bladder

noun

1. Also called: swim bladder. ichthyol an air-filled sac, lying above the alimentary canal in bony fishes, that regulates buoyancy at different depths by a variation in the pressure of the air

2. any air-filled sac, such as one of the bladders of seaweeds

air bladder

1. An air-filled sac in many fish that helps maintain buoyancy or, in some species, helps in respiration, sound production, or hearing.

2. Also called swim bladder

3. See float

Word History and Origins

Origin of air bladder¹

First recorded in 1725–35