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 Maxi Kleber is listed as probable with a right knee effusion, but is expected to play. Callie Caplan, Dallas News, "Mavericks remain relatively healthy ahead of season opener vs. Suns," 22 Dec. 2020 In his crude way, Trump understands a truth that more seemly public figures are innocent of: a voluntary apology, the effusion of spontaneous feeling, may be counted as magnanimous, but an extorted apology looks nerveless. David Bromwich, Harper's Magazine, "Is America Ungovernable?," 27 Oct. 2020 Distant heart sounds could reflect pericardial effusion—fluid accumulating around the heart. Danielle Ofri, The New Yorker, "A Bellevue Doctor’s Pandemic Diary," 1 Oct. 2020 Precedents don’t easily come to mind in front of Pelton’s levitating motifs, subtle colors, effusions of light and the clear transparent space within which everything unfolds. Roberta Smith, New York Times, "‘Agnes of the Desert’ Joins Modernism’s Pantheon," 12 Mar. 2020 Their lingering foliage offers a week or so of green respite — and then spring kicks in with effusions of dicentra, uvularias, bloodroot and trilliums, with some Italian windflowers and Virginia bluebells joining the party. Adrian Higgins, Washington Post, "An unsettlingly warm winter unlocks flowering treasures," 19 Feb. 2020 Emerging from insistent chuggings and pulsings, violins introduce lush effusions and the music goes full Hollywood before piano and sandpaper scrapings fade away into the distance. Scott Cantrell, Dallas News, "An elegantly structured Dallas Symphony program, but performances weren’t the best," 7 Mar. 2020 Announcements of the imminent construction of major monuments followed similar effusions of massive visitor numbers. Bright Simons, Quartz Africa, "Ghana’s Year of Return is on its way to success so the government should stop using bad data," 20 Dec. 2019 Sometimes actually seems to be quite often, as the path to the White House has become a blue streak of vulgarity, cuss words and four-letter effusions. Author: Mark Z. Barabak, Anchorage Daily News, "What the #%&@?! Trump and 2020 Democrats are cursing a blue streak," 24 Sep. 2019

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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Time Traveler for effusion

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

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Cite this Entry

“Effusion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/effusion. Accessed 6 May. 2021.

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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

Nglish: Translation of effusion for Spanish Speakers

Britannica English: Translation of effusion for Arabic Speakers

Britannica.com: Encyclopedia article about effusion

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