factor IX

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factor IX

n.
A protein substance in blood plasma that is essential for the clotting of blood. A deficiency of this factor is the cause of Christmas disease.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.factor IX - coagulation factor whose absence is associated with hemophilia B
Christmas factor
clotting factor, coagulation factor - any of the factors in the blood whose actions are essential for blood coagulation
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References in periodicals archive
In hemophilia B (Christmas disease), the second most common type, factor IX (plasma thromboplastin component) is lacking.
A primer on hemophilia
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