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x-coordinate
x-div.
x-height
X-inactivation
x out
X-radiation
X-rated
X-ray
X-ray astronomy
X-ray crystallography
X-ray diffraction
X-ray fluorescence
X-ray spectrum
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X-ray tube
X12
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X-ray astronomy
X-ray as·tron·o·my


noun 
Definition:
 
astronomy using X-ray emissions: the branch of astronomy in which the properties of astronomical objects are determined using the X-rays they emit
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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