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XR
+/--- X-Ray
/---- export reactor
/---- X-ray Reflectivity
AcroLexic: Dictionary of Acronyms and Abbreviations contains 1 more definition of “XR”.
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See also

Acronym Definitions
SXR 4
XRT 4
CXR 3
XRD 3
XRF 3
XRS 3
XRR 2
TXRF 2
NEXRAD 2
EXR 2
XRAY 2
TXR 2
MXR 2
DXRD 2
BXR 2
XRL 2
OXR 2
FXR 2
BBXRT 1
XRI 1