Effusion (disambiguation)
# 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
