X-rays 33
Xenophobia 30
XML (Document markup language) 20
X-ray crystallography 12
X-Rays 11
Xhosa (African people) 9
X-ray spectroscopy 8
Xenobiotics 6
Xenografts 6
Xylophone music 5
X-Ray Diffraction 4
X Chromosome 3
X chromosome 3
X-ray astronomy 3
XHTML (Document markup language) 3
Xavante Indians 3
Xenarthra 3
Xhosa poetry 3
X Chromosome Inactivation 2
X-ray lasers 2
X-ray microscopy 2
X-ray photoelectron spectroscopy 2
X-ray spectroscopy in archaeology 2
Xavante (South American people) 2
Xbox video games 2
Xerography 2
Xhosa language 2
Xhosa literature 2
X, Malcolm, 1
X-15 (Rocket aircraft) 1
X-43A (Hypersonic plane) 1
X-Men (Fictitious characters) 1
X-Men films 1
X-linked mental retardation 1
X-ray absorption near edge structure 1
X-ray microanalysis 1
X-ray optics 1
X-ray sources, Galactic 1
X3D (Standard) 1
XBRL (Document markup language) 1
XPath (Computer program language) 1
XSLT (Computer program language) 1
Xenopus 1
Xenopus laevis 1
Xeric ecology 1
Xeriscaping 1
Xerostomia 1
Xin (The Chinese word) 1
Xinca language 1