thrombosis

noun

throm·​bo·​sis thräm-ˈbō-səs How to pronounce thrombosis (audio)
thrəm-
plural thromboses thräm-ˈbō-ˌsēz How to pronounce thrombosis (audio)
thrəm-
: the formation or presence of a blood clot within a blood vessel
thrombotic adjective

Examples of thrombosis in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
According to the American Lung Association, about 900,000 people are affected each year by pulmonary embolism and deep vein thrombosis (DVT), a related condition that happens when a blood clot forms in a vein, and about 100,000 people die from them. Helen Carefoot, Flow Space, 10 Feb. 2026 Usually a deep vein thrombosis (DVT) or blood clot that can lead to a PE occurs in one leg, but not both, so pay attention to one-sided pain. Erica Sloan, SELF, 10 Feb. 2026 Pulmonary embolism is a type of venous thromboembolism, which also includes deep vein thrombosis. Emily Kay Votruba, EverydayHealth.com, 10 Feb. 2026 But two weeks later and without warning, thrombosis killed her. Shannon Taggart, Artforum, 1 Feb. 2026 See All Example Sentences for thrombosis

Word History

Etymology

New Latin, from Greek thrombōsis clotting, from thrombousthai to become clotted, from thrombos clot

First Known Use

1857, in the meaning defined above

Time Traveler
The first known use of thrombosis was in 1857

Browse Nearby Words

Cite this Entry

“Thrombosis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/thrombosis. Accessed 18 Feb. 2026.

Kids Definition

thrombosis

noun
throm·​bo·​sis thräm-ˈbō-səs How to pronounce thrombosis (audio)
plural thromboses -ˈbō-ˌsēz How to pronounce thrombosis (audio)
: the formation or presence of a blood clot within a blood vessel

Medical Definition

thrombosis

noun
throm·​bo·​sis thräm-ˈbō-səs, thrəm- How to pronounce thrombosis (audio)
plural thromboses -ˌsēz How to pronounce thrombosis (audio)
: the formation or presence of a blood clot within a blood vessel see coronary thrombosis, deep vein thrombosis

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