| Xerxes I |
XFDL |
XGA |
X-guide |
Xhosa Wars (1779–1879) |
| XHTML |
Xia (c.21st century–c.16th century bc) |
Xichang Satellite Launch Centre |
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 |
nightingale |
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