Pronunciation: (i-fyOO'zhun), [key]
1. the act of effusing or pouring forth.
2. something that is effused.
3. an unrestrained expression, as of feelings: poetic effusions.
4. Pathol.
a. the escape of a fluid from its natural vessels into a body cavity.
b. the fluid that escapes.
5. Physics.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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

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