1) Congestion 
Hydrothorax is a type of pleural effusion in which serous fluid accumulates in the pleural cavity. This specific condition can be related to cirrhosis with ascites in which ascitic fluid leaks into the pleural cavity. Hepatic hydrothorax is often difficult to manage in end-stage liver failure and often fails to respond to therapy. In similar pleur...
A contraction for hydropsy. The presence of abnormally large amounts of fluid. Congestive heart failure.
• (n.) An accumulation of serous fluid in the cavity of the chest.
(hi″dro-thor´aks) a pleural effusion containing serous fluid.
A condition in which the thoracic cavity is filled with excess fluid.Fluid within the chest. Usually will mean fluid in the space around the lungs i.e. a pleural effusion
Hy`dro·tho'rax noun [ Hydro- , 1 + thorax .] (Medicine) An accumulation of serous fluid in the cavity of the chest. 
Type: Term Pronunciation: hī-drō-thōr′aks Synonyms: pleural effusion
See dropsy.
Hydrothorax is an accumulation of fluid in one or both pleural cavities, often resulting from disease of the heart or kidneys.
congestion of the lungs, see also dropsy
[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
the presence of serous fluid in one or both pleural cavities.