Webster's English Dictionary

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bladder

blad.der \'blad-*r\ n [ME, fr. OE bl-dre; akin to OHG bla-tara 
   bladder, OE] bla-wan to blow 1a: a membranous sac in animals that serves as 
   the receptacle of a liquid o r contains gas; esp : the urinary bladder 1b: 
   VESICLE  2: something resembling a bladder esp. in being inflatable