Apedia

Spectrum |ˈspɛktrəm| Noun Band Colours Rainbow Produced Separation

Front spectrum
|ˈspɛktrəm|
Back noun
1
a band of colours, as seen in a rainbow, produced by separation of the components of light by their different degrees of refraction according to wavelength.
2
used to classify something in terms of its position on a scale between two extreme points:

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