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X-radiation
X-rated
X-ray
X-ray astronomy
X-ray crystallography
X-ray diffraction
X-ray fluorescence
X-ray spectrum
X-ray star
X-ray therapy
X-ray tube
X12
Xanadu
xanth-
xanthan gum
xanthate
xanthene
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X-ray star
X-ray star (plural X-ray stars) or X-ray source (plural X-ray sources)


noun 
Definition:
 
star that emits X-rays: an astronomical object that emits X-rays in addition to other types of radiation
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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