from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An air-filled structure in many fishes that functions to maintain buoyancy or, in some species, to aid in respiration. Also called swim bladder.
- n. See float.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An internal organ that fish use to control their buoyancy, allowing them to maintain or change depth by changing their density.
from the GNU version of the Collaborative International Dictionary of English
- 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.
from The Century Dictionary and Cyclopedia
- n. A vesicle in an organic body filled with air.
- n. In ichthyology, the sound or swim-bladder; a symmetrical bladder or sac filled with air, generally situated directly under the vertebral column in front, and homologous with the lungs of airbreathing animals.
- n. See air-float.
- n. In entomology, one of the numerous bladder-like endings of smaller tracheæ? in the bodies of many insects, which, filled with air, greatly reduce the specific gravity of the insect.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an air-filled sac near the spinal column in many fishes that helps maintain buoyancy
Sorry, no etymologies found.