a blood constituent necessary for clotting, the absence of which is characterized by a hemophilialike condition.
Origin of Christmas factor
see origin at Christmas disease
Also called factor IX, plasma thromboplastic component.
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Medical definitions for christmas factor
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.