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adjective
resembling or characteristic of a phantom
"spectral emanations"
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of or relating to a spectrum
"spectral colors"
"spectral analysis"
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disperse
separate (light) into spectral rays
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chromatic
able to refract light without spectral color separation
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prismatic
exhibiting spectral colors formed by refraction of light through a prism
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hyperfine
extremely fine or thin, as in a spectral line split into two or more components