se·​rous ˈsir-əs How to pronounce serous (audio)
: of, relating to, or resembling serum
especially : of thin watery constitution
a serous exudate
see also serous fluid

Examples of serous in a Sentence

Recent Examples on the Web The heart gets not one but two bags: a tough outer fibrous pericardium and a serous pericardium, protecting the heart and fixing it firmly in place in our constantly moving thorax. Bethany Brookshire, Scientific American, 27 Dec. 2023 This group of serous young Americans actually established the Libertarian Party that was to become the only political party in America that was founded to work in a principled and consistent way for everyone’s liberty, on every issue. Richard Boddie, Orange County Register, 28 May 2024 Molten sulfur can cause serous thermal burns upon contact and will form toxic and flammable gases when reacting to hydrocarbon, a compound at the heart of fossil fuels. Erick Mendoza, NBC News, 25 June 2023 Her case was complicated by a serous choroidal detachment, an abnormal accumulation of fluid, which ultimately led to vision loss in the left eye. Janelle Chavez, CNN, 24 Mar. 2023 Google corrected me: central serous. Liane Kupferberg Carter, Longreads, 10 Aug. 2020 A year after his fall, Graham was diagnosed with endometrial serous carcinoma, a rare and aggressive form of uterine cancer. Katy Waldman, The New Yorker, 1 Jan. 2023 Musk offered $44 billion for the platform in April, which at the time felt like a deliciously grandiose rich-guy flex, rather than a serous bid. Raven Smith, Vogue, 9 Nov. 2022 Zachary said that there are serous gardeners, or those who like to see the works of other serious gardeners, who travel the world specifically for such tours. cleveland, 4 June 2022

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

Word History


Middle English cerose, serose, serous, borrowed from Medieval Latin serōsus, from Latin serum "whey, wheylike fluid" + -ōsus -ous — more at serum entry 1

First Known Use

15th century, in the meaning defined above

Time Traveler
The first known use of serous was in the 15th century

Dictionary Entries Near serous

Cite this Entry

“Serous.” Dictionary, Merriam-Webster, Accessed 22 Jul. 2024.

Medical Definition


se·​rous ˈsir-əs How to pronounce serous (audio)
: of, relating to, producing, or resembling serum
especially : having a thin watery constitution
a serous exudate

More from Merriam-Webster on serous

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