gas-bladder

gas bladder

noun
air bladder ( def 2 ).
Dictionary.com Unabridged

air bladder

noun
1.
a vesicle or sac containing air.
2.
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:
1725–35

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
air bladder
 
n
1.  ichthyol Also called: swim bladder 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

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
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. Also called swim bladder.

  2. See float.


The American Heritage® Science Dictionary
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