noun
Usage: usually capitalized X
: a spectrometer for measuring the angles of diffraction of X rays produced by reflection from a crystal or for measuring X-ray spectra
noun
Usage: usually capitalized X
: a spectrometer for measuring the angles of diffraction of X rays produced by reflection from a crystal or for measuring X-ray spectra
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012