effusion

noun

ef·​fu·​sion i-ˈfyü-zhən How to pronounce effusion (audio)
e-
1
: an act of effusing
2
: unrestrained expression of words or feelings
greeted her with great effusionOlive H. Prouty
3
a(1)
: the escape of a fluid from anatomical vessels by rupture or exudation
(2)
: the flow of a gas through an aperture whose diameter is small as compared with the distance between the molecules of the gas
b
: the fluid that escapes

Examples of effusion in a Sentence

Her poetic effusions became tiresome.
Recent Examples on the Web
These examples are automatically compiled from online sources to illustrate current usage. Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Pleural effusion: The tissue that lines the chest cavity and surrounds the lungs can become diseased or inflamed, causing the lungs to fill with fluid. Mark Gurarie, Verywell Health, 30 Oct. 2024 Schröder had been dealing with right Achilles soreness, Smith with right hip synovitis and Finney-Smith with a left knee effusion. C.j. Holmes, New York Daily News, 12 Apr. 2024 His great achievement, and Moses’s and Neugebauer’s, lies in the fact that such an effusion — hardly the only one in The Ally — feels not only truthful but real, earned and human, an expression not of writerly grandiosity but of character need. Sara Holdren, Vulture, 28 Feb. 2024 Reddish played just two games before suffering the ankle injury after missing three consecutive games because of left knee effusion (swelling). Khobi Price, Orange County Register, 26 Jan. 2024 See all Example Sentences for effusion 

Word History

Etymology

Middle English effusioun "emission, shedding," borrowed from Anglo-French effusiun, borrowed from Latin effūsiōn-, effūsiō, from effud-, variant stem of effundere "to pour out, discharge, expend" + -tiōn-, -tiō, suffix of action nouns — more at effuse entry 1

First Known Use

15th century, in the meaning defined at sense 1

Time Traveler
The first known use of effusion was in the 15th century

Dictionary Entries Near effusion

Cite this Entry

“Effusion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/effusion. Accessed 17 Nov. 2024.

Kids Definition

effusion

noun
ef·​fu·​sion i-ˈfyü-zhən How to pronounce effusion (audio)
e-
1
: free expression of words or feelings
2
a
: escape of a fluid from containing vessels
b
: the fluid that escapes

Medical Definition

effusion

noun
ef·​fu·​sion i-ˈfyü-zhən, e- How to pronounce effusion (audio)
1
a
: the escape of a fluid from anatomical vessels by rupture or exudation
b
: the flow of a gas through an aperture whose diameter is small as compared with the distance between the molecules of the gas
2
: the fluid that escapes by extravasation see pleural effusion

More from Merriam-Webster on effusion

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