effusion

[ ih-fyoo-zhuh n ]
/ ɪˈfyu ʒən /

noun

the act of effusing or pouring forth.
something that is effused.
an unrestrained expression, as of feelings: poetic effusions.
Pathology.
  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 formsnon·ef·fu·sion, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for effusion

British Dictionary definitions for effusion

effusion

/ (ɪˈfjuːʒən) /

noun

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
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

Medicine definitions for effusion

effusion

[ ĭ-fyōōzhən ]

n.

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

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.