factor IX
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Related to factor IX: factor XI
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.
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Noun | 1. | factor IX - coagulation factor whose absence is associated with hemophilia B clotting factor, coagulation factor - any of the factors in the blood whose actions are essential for blood coagulation |
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