xi

 
Pronunciation: /ksʌɪ, gzʌɪ, sʌɪ, zʌɪ/

noun

  • the fourteenth letter of the Greek alphabet (Ξ, ξ), transliterated as ‘x’.
  • (Xi) [followed by Latin genitive] Astronomy the fourteenth star in a specified constellation: Xi Cygni

Origin:

Greek