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Christmas factor

noun, Biochemistry
1.
a blood constituent necessary for clotting, the absence of which is characterized by a hemophilialike condition.
Also called factor IX, plasma thromboplastic component.
Origin

factor IX

noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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factor-ix in Medicine

Christmas factor n.
See factor IX.

factor IX n.
A factor in the clotting of blood necessary for the formation of intrinsic blood thromboplastin; a deficiency of it causes hemophilia B. Also called antihemophilic globulin B, Christmas factor.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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