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ef·​fuse i-ˈfyüz How to pronounce effuse (audio)
effused; effusing

transitive verb

: to pour out (a liquid)

intransitive verb

: to flow out : emanate
: to make a great or excessive display of enthusiasm
they effused about his accomplishments


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ef·​fuse i-ˈfyüs How to pronounce effuse (audio)
: diffuse
specifically : spread out flat without definite form
effuse lichens

Examples of effuse in a Sentence

Verb pundits who should have known better effused endlessly about this idealistic but naive senator
Recent Examples on the Web
Noxious volcanic gases may also be a problem—in particular, sulfur dioxide, which effuses from shallow magma. Robin George Andrews, Scientific American, 13 Feb. 2024 Secretary of State Hillary Clinton effused that Gaddafi’s ouster and death marked smart diplomacy at its best. Armstrong Williams, Baltimore Sun, 2 Feb. 2024 Here are the meadows effusing and fermenting—spontaneously erupting. John Kinsella, The New Yorker, 11 Dec. 2023 Ben Stas for The Boston Globe/The Boston Globe Later, as night fell over the festival’s iconic Ferris wheel, a technically audacious 90-minute set from Australia’s King Gizzard and the Lizard Wizard had hardcore fans effusing over the band’s relentless leveling-up. James Sullivan, BostonGlobe.com, 29 May 2023 Now, at least outwardly, Felker effuses positivity and displays wry humor onstage. Josh Crutchmer, Rolling Stone, 3 May 2023 Bleeding back into the environment, spores effuse from the corpse to infect again. Kyle Hill, Discover Magazine, 25 June 2013 In the weeks before the appearance of those lava-effusing fissures on its eastern flanks, the volcano had been inflating. Robin George Andrews, New York Times, 22 Apr. 2020 The Eritrean leader also effused about the new era of friendly relations between the two countries. Elias Meseret, The Christian Science Monitor, 9 July 2018

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'effuse.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History



borrowed from Latin effūsus, past participle of effundere "to pour out, discharge, expend," from ef- ex- entry 1 + fundere "to pour, shed" — more at found entry 5


borrowed from Latin effūsus — more at effuse entry 1

First Known Use


1526, in the meaning defined at transitive sense


circa 1530, in the meaning defined above

Time Traveler
The first known use of effuse was in 1526

Dictionary Entries Near effuse

Cite this Entry

“Effuse.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/effuse. Accessed 28 May. 2024.

Medical Definition


ef·​fuse i-ˈfyüs, e- How to pronounce effuse (audio)
: spread out flat without definite form
an effuse colony of bacteria
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