effusion
Americannoun
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the act of effusing or pouring forth.
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something that is effused.
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an unrestrained expression, as of feelings.
poetic effusions.
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Pathology.
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the escape of a fluid from its natural vessels into a body cavity.
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the fluid that escapes.
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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.
noun
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an unrestrained outpouring in speech or words
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the act or process of being poured out
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something that is poured out
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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
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med
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the escape of blood or other fluid into a body cavity or tissue
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the fluid that has escaped
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Other Word Forms
- noneffusion noun
Etymology
Origin of effusion
1350–1400; Middle English (< Anglo-French ) < Latin effūsiōn- (stem of effūsiō ), equivalent to ef- ef- + fūsion- fusion
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
In 2019, he underwent surgery for pericardial effusion - a condition affecting the heart.
From BBC • Aug. 5, 2025
AOM is often confused with otitis media with effusion, or fluid behind the ear, a condition that generally does not involve bacteria and does not benefit from antimicrobial treatment.
From Science Daily • Mar. 4, 2024
The Lakers shut down Cam Reddish for more than a week, hoping the time off would speed up his recovery from a left knee effusion injury.
From Los Angeles Times • Jan. 22, 2024
Some at Asbury said they preferred the term “outpouring,” as in an almost tangible effusion of the Holy Spirit.
From New York Times • Feb. 23, 2023
Was it, as “Batty” pretends, a mere effusion of grief?
From "Harry Potter and the Deathly Hallows" by J.K. Rowling
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.