Effusion (disambiguation)

Effusion is the process of gases passing through a small hole.

Effusion may also refer to:

Medicine The seeping of fluid into a body cavity, the fluid itself, or an abnormal collection of fluid in a body cavity or space: Ascites Pericardial effusion Pleural effusion Joint effusion Subdural Effusion Mastoid Effusion Knee effusion Sometimes called "hydrops"

Geology Effusive eruption, an effusion of lava from a volcano