hy·dro·tho·rax /-ˈθorˌæks, ˈθɔr-/
  hy·dro·tho·rax /-ˈθo(ə)rˌæks, ˈθɔ(ə)r-/ 名詞
  Hy·dro·tho·rax n.  Med. An accumulation of serous fluid in the cavity of the chest.
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  hydrothorax
       n : accumulation of fluid in the pleural cavity (the space
           between the lungs and the walls of the chest) often
           resulting from disease of the heart or kidneys