xi
xi / zī; ksī/ • n. the fourteenth letter of the Greek alphabet (Ξ, ξ), transliterated as ‘x.’ ∎ (Xi) [followed by Latin genitive] Astron. the fourteenth star in a specified constellation: Xi Cygni.
Factor XI
Factor XI n. a coagulation factor normally present in blood. Deficiency of the factor is inherited, but rarely causes spontaneous bleeding. However, bleeding does occur after surgery or trauma to the blood vessels.
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Xi