x
X planes
X-1
X-2
X-3
X-4
X-5
X-15
X-24
X-33
X-38
X-43A
X-51 Waverider
xanthate
xanthophyll
x-axis
XCOR Aerospace
XE-Prime (nuclear reactor)
Xena
xenobiology
xenon
xenon-ion propulsion
Xenophanes (c.570–475 BC)
XIPS
xylem
XMM-Newton Observatory
X-pentomino
X-Racer
X-ray binary
X-ray burst
X-ray cluster
X-ray crystallography
X-ray diffraction
X-ray jet variable
X-ray nova
X-ray pulsar
X-ray satellites
X-ray transient
X-ray tube
X-rays
X-rays (for medical diagnosis)
xylene

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