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Meaning 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.