noun
: the part of the electromagnetic spectrum to which the human eye is sensitive extending from a wavelength of about 3800 angstroms for violet light to about 7600 angstroms for red light
noun
: the part of the electromagnetic spectrum to which the human eye is sensitive extending from a wavelength of about 3800 angstroms for violet light to about 7600 angstroms for red light
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012