Meaning of SPECTRUM in English

SPECTRUM

( n. )

A luminous appearance, or an image seen after the eye has been exposed to an intense light or a strongly illuminated object. When the object is colored, the image appears of the complementary color, as a green image seen after viewing a red wafer lying on white paper. Called also ocular spectrum.

Webster's Revised Unabridged English Dictionary.      Пересмотренный полный словарь английского языка Webster.