[1] : The Collaborative International Dictionary of English v.0.48

bladder \blad"der\ bla^d"d~er, n. oe. bladder, bleddre,
   as. bl=aedre, bl=aeddre; akin to icel. blaethra, sw.
   blaumddra, dan. blaere, d. blaar, ohg. bl=atara the
   bladder in the body of animals, g. blatter blister, bustule;
   all fr. the same root as as. bl=awan, e. blow, to puff. see
   blow to puff.
   1913 webster
   1. anat. a bag or sac in animals, which serves as the
      receptacle of some fluid; as, the urinary bladder; the
      gall bladder; -- applied especially to the urinary
      bladder, either within the animal, or when taken out and
      inflated with air.
      1913 webster

   2. any vesicle or blister, especially if filled with air, or
      a thin, watery fluid.
      1913 webster

   3. bot. a distended, membranaceous pericarp.
      1913 webster

   4. anything inflated, empty, or unsound. "to swim with
      bladders of philosophy." --rochester.
      1913 webster

   bladder nut, or bladder tree bot., a genus of plants
      staphylea with bladderlike seed pods.

   bladder pod bot., a genus of low herbs vesicaria with
      inflated seed pods.

   bladdor senna bot., a genus of shrubs colutea, with
      membranaceous, inflated pods.

   bladder worm zool., the larva of any species of tapeworm
      taenia, found in the flesh or other parts of
      animals. see measle, cysticercus.

   bladder wrack bot., the common black rock weed of the
      seacoast fucus nodosus and fucus vesiculosus --
      called also bladder tangle. see wrack.
      1913 webster
see also:
blow bladder nut bladder tree staphylea bladder pod vesicaria 
bladdor senna colutea bladder worm taenia measle 
cysticercus bladder wrack fucus nodosus fucus vesiculosus bladder tangle 
wrack 

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