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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
xanthic acid
xanthine
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X-ray tube
X-ray tube (plural X-ray tubes)


noun 
Definition:
 
vacuum tube producing X-rays: a vacuum tube in which a stream of high-energy electrons is made to strike a metal target to produce X-rays
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