| Xerxes I |
XFDL |
XGA |
X-guide |
Xhosa Wars (1779–1879) |
| XHTML |
Xia (c.21st century–c.16th century bc) |
Xichang Satellite Launch Centre |
Xi Jinping (1953) |
X inactivation |
| X-inefficiency |
Xinglong Observatory |
Xiongnu |
Xi’an incident (December 1936) |
Xmas tree |
| XML |
XML database |
XML schema |
XMM-Newton |
XModem |
| XMS memory |
X-ON/X-OFF |
X/OPEN |
XOR |
xor |
| XPath |
XPL |
xpols |
X prize |
XPS |
| XQuery |
X-ray |
X-ray astronomy |
X-ray background |
X-ray binary |
| X-ray bright point |
X-ray burst |
X-ray calorimeter |
X-ray crystallography |
X-ray diffraction |
| X-ray diffraction crystallography |
X-ray fluorescence |
X-ray fluorescence spectrometry |
X-ray lithography |
X-ray nova |
| X-ray photoelectron spectroscopy |
X-ray photography |
X-ray powder photograph |
X-ray pulsar |
X-rays |
| X-ray source |
X-ray sources |
X-ray spectrometer |
X-ray spectroscopy |
X-ray spectrum |
| X-ray spectrum (DRAFT) |
X-ray telescope |
X-ray Timing Explorer |
X-ray topography |
X-ray transient |
| X-ray tube |
XRF |
XS3 code |
niccolite |
niche |
| Nicholas I (1796–1855) |
Nicholas II (1868–1918) |
Nicholas of Autrecourt (c.1300–69) |
Nicholas of Cusa (1401–64) |
Nicholson, Seth Barnes |
| Nichols plot |
Nichrome |
nickel |
nickel arsenide structure |
nickel-cadmium cell |
| nickel carbonyl |
nickelic compounds |
nickel(III) oxide |
nickel(II) oxide |
nickel-iron cell |
| nickelous compounds |
nickel silver |
nickel(symbol: Ni) |
nickel–cadmium cell |
nickel–iron accumulator |
| nickel–iron meteorite |
Nicod’s criterion |
Nicole, Pierre (1625–95) |
Nicolle, Charles Jules Henri |
Nicollier, Claude (1944– ) |
| Nicol prism |
nicol prism |
Nicol, William |
Nicol, William (1768–1851) |
Nicopolis, Battle of (23 September 1396) |
| nicotinamide |
nicotinamide adenine dinucleotide |
nicotinamide adenine dinucleotide phosphate |
nicotine |
nicotinic |
| nicotinic acid |
nictitating membrane |
nidation |
nidicolous |
nidifugous |
| nido-structure |
nielsbohrium |
Niemöller, Martin (1892–1984) |
Niepce, Joseph-Nicéphore |
Nietzsche, Friedrich (1844–1900) |
| NIFE cell |
Niger |
Nigeria |
Nigerian Civil War |
Nigerian fraud |
| NigeriaSat-2 |
NigeriaSat-X |
Niggli method |
Niggli, Paul (1888–1953) |
nightglow |
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