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x X Xanadu Xanax xanth- xanthan xanthan gum xanthate Xanthe xanthein xanthene xanthene dye Xanthian xanthic xanthic acid xanthin xanthine Xanthippe xanthism xantho- xanthochroid xanthochroism xanthoma xanthophore xanthophyll xanthosiderite xanthous Xanthus xat Xaverian Brother Xavier x-axis xc X-C X chromosome X-chromosome xcl xd Xda x-disease Xe xebec Xenakis xenia Xenia xenial xenic acid Xenical Xennial xeno- xenobiotic xenoblast xenobot Xenocrates xenocryst xenocurrency xenodiagnosis xenogamy xenogeneic xenogenesis xenoglossia xenograft xenolith xenomorphic xenon xenon arc xenon hexafluoride xenon tetrafluoride xenon trioxide Xenophanes xenophile xenophilia xenophobe xenophobia xenophobic Xenophon xenotransplant xenotransplantation xeranthemum xerarch Xeres xeric xeriscaping xero- xeroderma xeroderma pigmentosum xerography xeromorphic xerophagy xerophilous xerophthalmia xerophyte xeroradiograph xerosere xerosis xerostomia xerothermic Xerox xerus Xerxes I x-height Xhosa xi Xi Xi'an Xia Gui Xiamen xian Xian Xiang Xianggang Xiang Jiang Xiangtan xi baryon xi-c baryon Xi Jiang Xikang Ximenes x in Xing Xingú Xinhua Xining Xinjiang Xinjiang Uygur Autonomous Region x-intercept Xinxiang xi particle Xipe xiphi- xiphisternum xiphoid xiphosuran x-irradiate Xixón Xizang Autonomous Region XL x-line X-linked XLNT X marks the spot Xmas XML Xn Xn. Xnty Xnty. XO xoanon Xochimilco xocolatophobia XOR Xosa XP x pr XQ xr XR x-radiate x-radiation X-rated x-ray X-ray x-ray astronomy X-ray astronomy X-ray binary x-ray binary star x-ray burster x-ray crystallography X-ray crystallography x-ray diffraction X-ray diffraction x-ray photograph x-ray spectrometer x-ray spectrometry x-ray star x-ray technician x-ray therapy X-ray therapy x-ray tube X-ray tube XS x-stretcher Xt Xt. Xtian. Xty. xu Xuan Tong Xuan-tong Xuan Zang Xuan Zong x-unit Xun Zi Xuthus XUV Xuzhou X-wave XX XXX XXXX xylan xylem xylem ray xylene xylic acid xylidine xylitol xylo- xylocarp xylogenous xylograph xylography xyloid xylol xylophage xylophagous xylophilous xylophone xylorimba xylose xylostroma xylotomous xylotomy xylyl XY recorder xyst xyster xystum xystus Xystus I XYZ