American Heritage® Dictionary of the English Language, Fourth Edition
- n. See air bladder.
Century Dictionary and Cyclopedia
- n. Same as swimming-bladder.
- n. anatomy, usually of fish A gas-filled sac within the bodies of most fish that variously acts as a float, lung, sound-producing organ or an aid to hearing.
GNU Webster's 1913
- n. an air bladder of a fish.
- n. an air-filled sac near the spinal column in many fishes that helps maintain buoyancy
“Manatees and dugongs float effortlessly in hydrostatic equilibrium, not by means of a swim bladder as fish do see below, but through being equipped with heavy bones as a counterweight to the natural buoyancy of their blubber.”
“The swim bladder is perhaps the major key to the teleosts’ success, and it is well worth a digression to explain it.”
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