Definition of spectrum
- n. - An apparition; a specter.
- n. - The several colored and other rays of which light is
composed, separated by the refraction of a prism or other means, and
observed or studied either as spread out on a screen, by direct vision,
by photography, or otherwise. See Illust. of Light, and Spectroscope.
- 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.