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[ih-fyoo-zhuh n] /ɪˈfyu ʒən/
the act of effusing or pouring forth.
something that is effused.
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.
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 of effusion
1350-1400; Middle English (< Anglo-French) < Latin effūsiōn- (stem of effūsiō), equivalent to ef- ef- + fūsion- fusion
Related forms
noneffusion, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for effusion
  • 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.
  • The authorities were engaged in devising the means for preventing the further effusion of blood.
  • Occasional peals of feminine laughter greeted periods of this effusion.
  • It is a dialogue effusion in which the players appear frequently to be waiting for a signal before they speak their lines.
  • At night, a brilliant effusion of pyrotechnics illuminated the harbor.
  • Flank vents located lower down the mountain erupt less frequently and explosively but have higher overall effusion rates.
  • Rather, they reflect the natural movement from campaign effusion to foreign-policy priorities.
British Dictionary definitions for effusion


an unrestrained outpouring in speech or words
the act or process of being poured out
something that is poured out
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
  1. the escape of blood or other fluid into a body cavity or tissue
  2. the fluid that has escaped
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for effusion

c.1400, "a pouring out," from Middle French effusion (14c.) and directly from Latin effusionem (nominative effusio) "a pouring forth," noun of action from past participle stem of effundere "pour forth, spread abroad," from ex- "out" (see ex-) + fundere "pour" (see found (v.2)). Figuratively, of speech, emotion, etc., from 1650s.

Online Etymology Dictionary, © 2010 Douglas Harper
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effusion in Medicine

effusion ef·fu·sion (ĭ-fyōō'zhən)

  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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