hemophilia A

noun

: the common form of hemophilia that is caused by a deficiency of factor VIII compare hemophilia b

Examples of hemophilia A in a Sentence

Recent Examples on the Web
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Bristol Myers Squibb Pfizer’s new drug for hemophilia A or B, genetic bleeding disorders, is also the first to target a particular protein in the blood-clotting process. Annika Kim Constantino,ashley Capoot, CNBC, 8 Jan. 2025 As a boy growing up with hemophilia A, Noah Frederick reserved the end of his annual checkups to talk about new technologies. Jason Mast, STAT, 13 Mar. 2024 About 15 to 20 percent have hemophilia B while the rest have hemophilia A, which is caused by low levels of another protein known as factor VIII. Jonathan Saltzman, BostonGlobe.com, 29 Jan. 2023 Hemgenix is the first such treatment for hemophilia and several other drugmakers are working on gene therapies for the more common form of the disorder, hemophilia A.. Matthew Perrone, Fortune, 23 Nov. 2022

Word History

First Known Use

1954, in the meaning defined above

Time Traveler
The first known use of hemophilia A was in 1954

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Cite this Entry

“Hemophilia A.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hemophilia%20A. Accessed 10 Sep. 2025.

Medical Definition

hemophilia A

noun
: the common form of hemophilia caused by a deficiency of factor VIII in the blood
Some boys with hemophilia A are endangered by any bump or scrape, while others have such mild forms that the disorder goes undetected until they lose their first tooth.Science News
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