/ Dictionary / Index X x-unit: Meaning and Definition of Find definitions for: x-u•nit Pronunciation: (eks'y"nit), [key] — n. 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. Xuan Zong Xuzhou Related Content Daily Word Quiz: ablution Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language