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xerophyte
xeroradiography
xerosis
xerostomia
xerothermic
Xerox
Xhosa
xi
xi hyperon
xi-particle
xiphisternum
xiphoid
xiphoid process
XL
Xmas
XML
Xmodem
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xi hyperon
xi hyperon (plural xi hyperons)


noun 
Definition:
 
elementary particle: a neutral or negatively charged elementary particle present in cosmic rays and in high-energy collisions in particle accelerators
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