Christmas factor

noun

One of the serine proteases of the coagulation system, whose absence leads to hemophilia.

Similar
factor IX
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Meanings

nounChristmas factor (uncountable)
  1. uncountableOne of the serine proteases of the coagulation system, whose absence leads to hemophilia.

Synonyms & antonyms

nouncoagulation factor whose absence is associated with hemophilia B

Similar
factor IX
Broader
coagulation factorclotting factor
Also see
antihemophilic factor bautoprothrombin iifactor ixprothromboplastin b

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

Named after Stephen Christmas; see Christmas disease.

Full word history & related roots →
Cite this entry
APA

Christmas factor. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/Christmas%20factor

MLA

“Christmas factor.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Christmas%20factor. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “Christmas factor,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/Christmas%20factor.

Source: Christmas factor on Wiktionary, CC BY-SA 4.0.