ef·​fu·​sion | \ i-ˈfyü-zhən How to pronounce effusion (audio) , e-\

Definition of effusion

1 : an act of effusing
2 : unrestrained expression of words or feelings greeted her with great effusion— Olive H. Prouty
3a(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

This was no slick Vegas headliner, with polished stage patter and fake effusions of love for the audience. Richard Zoglin, Time, "Inside the Las Vegas Show That Turned Elvis' Career Around," 23 July 2019 The Alps came through the clubhouse door to a mild effusion of hollers and hellos from the handful of patrons already ensconced. Colin Barrett, Harper's magazine, "The Alps," 22 July 2019 Fifty years later, Younghusband’s effusions about the mountains were accompanied by a neat list of the highest peaks in the world, most of them in the Himalayas and surveyed from a distance. Ipsita Chakravarty, Quartz India, "How colonialism cost the Himalayas their remoteness," 10 June 2019 The trademark of a Kennedy opinion was a verbal effusion that gestured toward profundity without overcoming confusion. James Hohmann, Washington Post, "The Daily 202: Abortion is already emerging as a top issue in the midterms with Supreme Court vacancy," 29 June 2018 Beyond simply delighting the ear and intellect, his aim seemed to be to generate excitement, to yield to the music's effusion and keep listeners in a state of breathless engagement. Zachary Lewis, cleveland.com, "Cleveland Orchestra's 'Prometheus Project' gets off to fiery start: review," 11 May 2018 The hot effusions are continually retouching the tropical landscape, a haven for native birds and endemic species such as a meat-eating caterpillar, a lava-loving cricket and the world's rarest goose. Andrea Sachs, chicagotribune.com, "This summer, stop by the 23 U.S. locales that have risen to become UNESCO World Heritage sites," 4 May 2018 The impact left Rand with six broken ribs, three displaced, pleural effusion and now pneumonia. James Freeman, WSJ, "#RandToo," 8 Dec. 2017 The campuses of the West too often loosen up the politics of the young through such immoral effusions. Douglas Murray, National Review, "The Russian Revolution, 100 Years On: Its Enduring Allure and Menace," 30 Oct. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'effusion.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of effusion

15th century, in the meaning defined at sense 1

History and Etymology for effusion

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

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Last Updated

6 Aug 2019

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

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English Language Learners Definition of effusion

formal : something that is said or expressed too much or with a lot of emotion
technical : a flow of liquid or gas


ef·​fu·​sion | \ i-ˈfyü-zhən, e- How to pronounce effusion (audio) \

Medical Definition of effusion

1a : 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

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More from Merriam-Webster on effusion

Rhyming Dictionary: Words that rhyme with effusion

Spanish Central: Translation of effusion

Nglish: Translation of effusion for Spanish Speakers

Britannica English: Translation of effusion for Arabic Speakers

Britannica.com: Encyclopedia article about effusion

Comments on effusion

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to shake or wave menacingly

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