x-unit

[ eks-yoo-nit ]

noun

1. a unit formerly used to express the wavelength of x-rays and gamma rays, equal to approximately 10− 11 centimeters. : Xu, XU

x-unit

noun

1. a unit of length equal to 0.100 202 × 10 ^–12metre, for expressing the wavelengths of X-rays and gamma rays

Example Sentences

The widened idea is that even when a or x is an irrational number we may speak of a or x unit lengths by measure.

From Project Gutenberg