X	XC
XCS	Xylene Cold Solubles
XCS	xylene cold soluble
XG	Xanthan gum
XLA	X-Linked Agammaglobulinemia
XLD	Xylose Lysine Deoxycholate
XLRP	X-linked retinitis pigmentosa
XNA	xeno nucleic acid
XNA	xeno nucleic acids
XP	xeroderma pigmentosum
XPS	XML paper specification
XRD	X-Ray Diffraction
XRD	X-ray diffractometry
XRF	X-Ray Fluorescence
XRPD	X-Ray Powder Diffraction
XRPD	X-ray Powder Diffractometer
XRPD	X-ray powder diffraction
XRR	X-ray reflection
XRR	X-ray reflectometer
XSD	XML Schema Definition