effusion

[ih-fyoo-zhuhn]
noun
1.
the act of effusing or pouring forth.
2.
something that is effused.
3.
an unrestrained expression, as of feelings: poetic effusions.
4.
Pathology.
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.

Origin:
1350–1400; Middle English (< Anglo-French) < Latin effūsiōn- (stem of effūsiō), equivalent to ef- ef- + fūsion- fusion

noneffusion, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
effusion (ɪˈfjuːʒən)
 
n
1.  an unrestrained outpouring in speech or words
2.  the act or process of being poured out
3.  something that is poured out
4.  the flow of a gas through a small aperture under pressure, esp when the density is such that the mean distance between molecules is large compared to the diameter of the aperture
5.  med
 a.  the escape of blood or other fluid into a body cavity or tissue
 b.  the fluid that has escaped

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

effusion
c.1400, from L. effusionem (nom. effusio), from stem of effundere "pour forth, spread abroad," from ex- "out" + fundere "pour" (see found (2)).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

effusion ef·fu·sion (ĭ-fyōō'zhən)
n.

  1. The escape of fluid from the blood vessels or lymphatics into the tissues or a cavity.

  2. The fluid so escaped.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Your doctor may order this test if you have signs of a heart infection or if
  you have pericardial effusion.
Your doctor may order this test if you have signs of a heart infection or a
  pericardial effusion with an unknown cause.
His disease was chronic inflammation of the stomach, attended with, dropsical
  effusion of the abdomen.
Dogwoods seemed to jump to attention with an effusion of white and pink
  blossoms.
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