Bladder
- A bladder is a pouch or other flexible enclosure with waterproof or gasproof walls.
- In the context of animals and anatomy, "bladder" usually refers to the urinary bladder. The term is generic and can also be used for other enclosures, such as the gallbladder.
- Zeppelins are kept buoyant by gas bladders, as are many species of kelp.
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