The Collaborative International Dictionary
air bladder \air" blad`der\
(Anat.) 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.
A sac or bladder full of air in an animal or plant; also an air hole in a casting.
Wiktionary
n. An internal organ that fish use to control their buoyancy, allowing them to maintain or change depth by changing their density.
WordNet
n. an air-filled sac near the spinal column in many fishes that helps maintain buoyancy [syn: swim bladder]
Usage examples of "air bladder".
Like a head with an empty air bladder, nothing to say and no breath to say it.
I unplug like air bladder my blood pour out upon the table for Her to lap up so much milk never come out of my breasts.
Nausea twisted through Laaqueel, and it felt like her air bladder had burst.
The wedge-shaped appendage slashed easily through the net and plunged on into Huaanton's trachea and air bladder.
An animal without an air bladder inside it is normally slightly heavier than water, so sinks to the bottom.
Somewhere in the middle of this continuum, an animal with an air bladder of exactly the right size neither sinks nor rises, but floats steadily in effortless equilibrium.
Boater explained that their external appearance stemmed from the large air bladder which surrounded their internal organs.
The air bladder allowed them to roll across large bodies of water, and to use rivers the same way ground cars use highways.
Laaqueel adjusted her air bladder and floated effortlessly, torn between what she hoped for and what she knew to be true.
He raised his head from the air bladder and shook it to clear the cobwebs.
The respirator went up and down, inflating the eel's air bladder as it pumped bloody froth out of Mason's lungs.
These had stronger skeletons than did the earlier types, and possessed an air bladder modified from a one-time lung that enabled them to match the density of the surrounding water and float at a given level without muscular effort.