[ih-fyoo-zhuh n]
  1. the act of effusing or pouring forth.
  2. something that is effused.
  3. an unrestrained expression, as of feelings: poetic effusions.
  4. Pathology.
    1. the escape of a fluid from its natural vessels into a body cavity.
    2. 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 of effusion

1350–1400; Middle English (< Anglo-French) < Latin effūsiōn- (stem of effūsiō), equivalent to ef- ef- + fūsion- fusion
Related formsnon·ef·fu·sion, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for effusions

Historical Examples of effusions

  • On the other hand if nothing can be gleaned from them, let the effusions and their author be forgotten.

  • So the paralysed woman had to accept the thanks and effusions that her heart repelled.

    Therese Raquin

    Emile Zola

  • The poet could carry all his effusions about in his pockets.

    My Reminiscences

    Rabindranath Tagore

  • Therefore I read with a callous heart the effusions of the Belgian damsel.

    Wintry Peacock

    D. H. Lawrence

  • In addition to these, there is another cause of the universality of these effusions.

British Dictionary definitions for effusions


  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
    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

Word Origin and History for effusions



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

effusions in Medicine


  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.