Definition of water bladder in English:

water bladder

noun

rare
  • 1A soft swelling or fluid-filled cyst, especially one associated with fascioliasis or hydatid disease in sheep.

  • 2A blister or vesicle on the skin, especially when filled with colourless fluid.

Origin

Late 16th century; earliest use found in Leonard Mascall (d. 1589), translator and author.