Bladder
WordNet
noun
(1) A bag that fills with air
(2) A distensible membranous sac (usually containing liquid or gas)
WiktionaryText
Etymology
Akin to Old High German (German ) and Old Norse (Danish ).
Noun
- A flexible sac that can expand and contract and that holds liquids or gases.
- Specifically, the urinary bladder.
- A hollow, inflatable organ of a plant.
- The inflatable bag inside various balls used in sports, such as footballs and rugby balls.