a vesicle or sac containing air.
Also called gas bladder, swim 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.
Origin of air bladder
First recorded in 1725–35
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Related Words for air bladderfloat
Examples from the Web for air bladder
Historical Examples of air bladder
British Dictionary definitions for air bladder
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
any air-filled sac, such as one of the bladders of seaweeds
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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An air-filled sac in many fish that helps maintain buoyancy or, in some species, helps in respiration, sound production, or hearing. Also called swim bladder
The American Heritage® Science Dictionary
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