hemophilia B

noun

: a mild to severe hemophilia that is caused by a deficiency of factor IX

called also Christmas disease

compare hemophilia a

Examples of hemophilia B 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.
Scientists across the country continue researching gene therapy and gene replacement therapy to treat hemophilia B and other forms the blood disorder, according to the Cleveland Clinic. Beth Warren, The Tennessean, 21 Aug. 2025 The firm plans to begin treating patients with severe hemophilia B in the United States by March 31. Jonathan Saltzman, BostonGlobe.com, 29 Jan. 2023 Pfizer said Thursday that its experimental gene therapy for hemophilia B significantly reduced the number of bleeds patients experienced over a year. Jason Mast, STAT, 29 Dec. 2022 The Food and Drug Administration cleared Hemgenix, an IV treatment for adults with hemophilia B, the less common form of the genetic disorder which primarily affects men. Matthew Perrone, Fortune, 23 Nov. 2022 See All Example Sentences for hemophilia B

Word History

First Known Use

1954, in the meaning defined above

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

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Cite this Entry

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

Medical Definition

hemophilia B

noun
: a mild to severe hemophilia that is caused by a deficiency of factor IX in the blood
Hemophilia B occurs mostly in males.… The inadequate or inactive supply of clotting factor results in periodic internal bleeding.K. A. Fackelmann, Science News

called also Christmas disease

Last Updated: - Updated example sentences
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