Xiphosura

Xiphosuridae

Xiphosurus

Xiphura

Xiphydria

Xiphydriidae

Xosa

Xylariaceae

Xyleborus

Xylocopa

Xylonite

Xylophagidae

Xyrichthys

Xyridaceae

Xipe-totec

Xiphium iris

X ray

X-ray cancer

X-ray photography

X-ray-proof

X-ray spectrograph

X-ray spectrum

X-ray therapy

X-shaped

X chromosome

X radiation

X-ray photograph

X-ray spectrometer

X-ray tube