effusion: Meaning and Definition of

ef•fu•sion

1. the act of effusing or pouring forth.
2. something that is effused.
3. an unrestrained expression, as of feelings: poetic effusions.
1. the escape of a fluid from its natural vessels into a body cavity.
2. the fluid that escapes.
5. the flow of a gas through a small orifice at such density that the mean distance between the molecules is large compared with the diameter of the orifice.