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bladder (n.)

Old English blædre (West Saxon), bledre (Anglian) "(urinary) bladder," also "blister, pimple," from Proto-Germanic *blodram "something inflated" (source also of Old Norse blaðra, Old Saxon bladara, Old High German blattara, German Blatter, Dutch blaar), from PIE root *bhle- "to blow." Extended senses from early 13c. from animal bladders used for buoyancy, storage, etc.

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Definitions of bladder

bladder (n.)
a distensible membranous sac (usually containing liquid or gas);
Synonyms: vesica
bladder (n.)
a bag that fills with air;
From wordnet.princeton.edu