hemophilia B


Definition of hemophilia B 

: 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

Alexei suffered from hemophilia B, a rare blood condition in which blood does not clot properly. Temi Adebowale, Town & Country, "A New Exhibit in London Showcases Rare, Previously Unseen Photos of the Romanov Family," 26 Sep. 2018 In hemophilia B, a form of the clotting disorder, UniQure is looking at a market that’s worth $1.5 billion annually, according to Elizabeth Krutoholow, a Bloomberg Intelligence analyst. Bloomberg.com, "After $1 Million Drug Flop, UniQure Revives in Gene Therapy," 6 Apr. 2018 Queen Victoria was the first in her family to carry hemophilia B, a blood clotting disorder. Chanel Vargas, Town & Country, "16 Fascinating Facts You Didn't Know About Queen Victoria," 4 Jan. 2018 More than 400,000 people around the world are estimated to suffer from hemophilia A, which is six times as common as hemophilia B, according to an accompanying editorial. Manisha Ganguly, CNN, "Hemophilia trial finds promising cure," 14 Dec. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'hemophilia B.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of hemophilia B

1954, in the meaning defined above

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Last Updated

12 Nov 2018

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The first known use of hemophilia B was in 1954

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hemophilia B


Medical Definition of hemophilia B 

: 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, 2 Oct. 1993

called also Christmas disease

Comments on hemophilia B

What made you want to look up hemophilia B? Please tell us where you read or heard it (including the quote, if possible).


the figure or shape of a crescent moon

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