Wiktionary
swim-bladder
n. (alternative spelling of swim bladder English)
Usage examples of "swim-bladder".
Seeing how important an organ of locomotion the tail is in most aquatic animals, its general presence and use for many purposes in so many land animals, which in their lungs or modified swim-bladders betray their aquatic origin, may perhaps be thus accounted for.
This may be true for gills and swim-bladders and forebrains, matters of detail, but not for the sky.