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Meaning of x-unit

x-u•nit

Pronunciation: (eks'y"nit), [key]
— n.
  1. a unit formerly used to express the wavelength of x-rays and gamma rays, equal to approximately 10− cm. Abbr.: Xu, XU
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.