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xeroradiography
xerosis
xerostomia
xerothermic
Xerox
Xhosa
xi
Xi’an
xi hyperon
Xi Jiang
xi particle
Xiamen
Xiangtan
Xingu
Xining
Xinjiang Uygur
xiphisternum
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xi hyperon
xi hy·per·on (plural xi hy·per·ons)


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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