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 The Brewers did make a couple roster moves, placing right-hander Luis Perdomo on the IL with right elbow effusion and recalling Miguel Sánchez from Nashville. Todd Rosiak, Milwaukee Journal Sentinel, 28 May 2022 Possible bad news for Jake Cousins Right-hander Jake Cousins, on the IL since Sunday with what was diagnosed as an elbow effusion, is undergoing further examination after an MRI revealed the possibility of more serious damage. Todd Rosiak, Milwaukee Journal Sentinel, 7 May 2022 If a writer like Rachel Cusk confronts the reader with the power of a taut, single consciousness, Bennett is stretching the forms that consciousness can take, to include effusion and hesitation, self-indulgence and equivocation. Lynn Steger Strong, The New Republic, 16 Mar. 2022 Lakers: For the Lakers, Anthony Davis (right wrist; soreness) and Malik Monk (left groin; soreness) are available; LeBron James (left knee; soreness/effusion) is out. oregonlive, 2 Feb. 2022 It’s not a powerful effusion, like anger, fear, or joy, but a refocusing of attention away from something. Melissa Mohr, The Christian Science Monitor, 24 Jan. 2022 Near the end, an effusion of Puccinian warmth yields to yet more punchy percussion, then a fanfaring pastiche of the Handelian Baroque before the work’s grimly quiet conclusion. New York Times, 24 Nov. 2021 Pleural inflammation is often accompanied by a buildup of fluid between two layers of the pleura (pleural effusion). SELF, 26 Nov. 2020 Shoppers will also notice an effusion of labradorite and diamonds throughout the collection. Halie Lesavage, Harper's BAZAAR, 16 Sep. 2021 See More

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.

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

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Last Updated

3 Jun 2022

Cite this Entry

“Effusion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/effusion. Accessed 25 Jun. 2022.

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More Definitions for effusion


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

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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