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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. 2018.
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Examples from the Web for effusions
Historical Examples
  • 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
  • Therefore I read with a callous heart the effusions of the Belgian damsel.

    Wintry Peacock D. H. Lawrence
  • The poet could carry all his effusions about in his pockets.

    My Reminiscences Rabindranath Tagore
  • In addition to these, there is another cause of the universality of these effusions.

  • But how voracious is this general reader in regard to the effusions of his own day!

  • His fame, however, is not likely to "gather strength" from these effusions.

    Bibliomania; or Book-Madness

    Thomas Frognall Dibdin
  • But after these effusions he would be seized with furious joy.

    Child of a Century, Complete Alfred de Musset
  • It is but very rarely that I partake of his effusions, for I am not to his taste.


    E. (Eliza) Fenwick
  • Why should I dwell upon the rage of fever, and the effusions of delirium?

    Wieland; or The Transformation Charles Brockden Brown
British Dictionary definitions for effusions


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 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
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effusions 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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