Effusion
Too much fluid, an outpouring of fluid.
A hemorrhagic effusion is one that has blood within the fluid.
A pericardial effusion is an outpouring of fluid within the fibrous sac (the pericardium) that surrounds the heart.
The lungs are covered by two-layered membranes which are called the pleura.
A pleural effusion involves the presence of an excessive amount of pleural fluid (between the two layers of the pleural membranes).
The term 'effusion' comes from the Latin 'effusio' meaning a pouring out