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Definition of X factor
1. Noun. (idiomatic) An unknown or hard-to-define influence; a factor with unknown or unforeseeable consequences. ¹
2. Noun. prothrombinase, also called factor X. ¹
3. Noun. (alternative spelling of X factor) ¹
¹ Source: wiktionary.com
Medical Definition of X factor
1.
Lexicographical Neighbors of X Factor
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