air bladder

• POS: Noun Phrase
• HYPHEN: air blad=der

CIDE DICTIONARY

air bladder,  

•  An air sac, sometimes double or variously lobed, in the visceral cavity of many fishes. It originates in the same way as the lungs of air-breathing vertebrates, and in the adult may retain a tubular connection with the pharynx or esophagus.  [1913 Webster]
•  A sac or bladder full of air in an animal or plant; also an air hole in a casting.  [1913 Webster]

ROGET THESAURUS

air bladder

Gaseity

N gaseity, vaporousness, flatulence, flatulency, volatility, aeration, aerification, elastic fluid, gas, air, vapor, ether, steam, essence, fume, reek, effluvium, flatus, cloud, ammonia, ammoniacal gas, volatile alkali, vacuum, partial vacuum, pneumatics, pneumatostatics, aerostatics, aerodynamics, gasmeter, gasometer, air bladder, swimming bladder, sound, (of a fish), gaseous, aeriform, ethereal, aerial, airy, vaporous, volatile, evaporable, flatulent.