effusion
noun
ef·fu·sioni-ˈfyü-zhən 
e-
1
:an act ofeffusing
2
:unrestrained expression of words or feelings
greeted her with greateffusion—
Olive H. Prouty
Olive H. Prouty3
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 ofeffusion in a Sentence
Her poeticeffusions became tiresome.
Recent Examples on the WebAccording to the autopsy findings, Strain showed signs of pulmonary edema and pleuraleffusions, which happens when too much fluid builds up in the lungs and chest cavity.—Craig Shoup,Nashville Tennessean, 21 Mar. 2025After her kidney was removed without her consent, Rappaport was diagnosed with respiratory failure, left pleuraleffusion, diastolic heart failure and Stage 5 kidney disease, according to the lawsuit.—Jennifer Rodriguez,Kansas City Star, 20 May 2025Pleuraleffusion: Pleural effusion occurs as a complication of bacterial pneumonia when fluid builds up between the lungs and chest wall.—Lindsay Curtis,Health, 13 Apr. 2025Mamdani facilitated this energy, working the line, oscillating between rousingeffusionson the cost of living and flashing a goofy, impish grin.—Paula Aceves,Curbed, 8 Mar. 2025See All Example Sentences foreffusion
Examples are automatically compiled from online sources to show current usage.Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.Send us feedback.
Craig Shoup,Nashville Tennessean, 21 Mar. 2025After her kidney was removed without her consent, Rappaport was diagnosed with respiratory failure, left pleuraleffusion, diastolic heart failure and Stage 5 kidney disease, according to the lawsuit.—Jennifer Rodriguez,Kansas City Star, 20 May 2025Pleuraleffusion: Pleural effusion occurs as a complication of bacterial pneumonia when fluid builds up between the lungs and chest wall.—Lindsay Curtis,Health, 13 Apr. 2025Mamdani facilitated this energy, working the line, oscillating between rousingeffusionson the cost of living and flashing a goofy, impish grin.—Paula Aceves,Curbed, 8 Mar. 2025See All Example Sentences foreffusionWord History
Etymology
Middle Englisheffusioun "emission, shedding," borrowed from Anglo-Frencheffusiun, borrowed from Latineffūsiōn-, effūsiō, fromeffud-, variant stem ofeffundere "to pour out, discharge, expend" +-tiōn-, -tiō, suffix of action nouns — more ateffuseentry 1
First Known Use
15th century, in the meaning defined atsense 1
Time Traveler
The first known use ofeffusion was in the 15th centuryRhymes foreffusion
Browse Nearby Words
Cite this Entry
“Effusion.”Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/effusion. Accessed 18 Jul. 2025.
Copy CitationKids Definition
effusion
nounef·fu·sioni-ˈfyü-zhən
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
nounef·fu·sioni-ˈfyü-zhən, e-
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 seepleural effusion
More from Merriam-Webster oneffusion
Nglish:Translation ofeffusion for Spanish Speakers
Britannica.com:Encyclopedia article abouteffusion
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