XUnit

x-unit

[eks-yoo-nit]
noun
a unit formerly used to express the wavelength of x-rays and gamma rays, equal to approximately 10− 11 cm. Abbreviation: Xu, XU
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x-unit
 
n
a unit of length equal to 0.100 202 × 10--12 metre, for expressing the wavelengths of X-rays and gamma rays

Collins English Dictionary - Complete & Unabridged 10th Edition
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