Etymology
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spectral (adj.)

1718, "capable of seeing spectres;" 1815, "ghostly;" from spectre + -al (1). Meaning "pertaining to a spectrum" is 1832, from stem of spectrum + -al (1). Related: Spectrally.

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Definitions of spectral

spectral (adj.)
of or relating to a spectrum;
spectral analysis
spectral colors
spectral (adj.)
resembling or characteristic of a phantom;
spectral emanations
Synonyms: apparitional / ghostlike / ghostly / phantasmal / spiritual
From wordnet.princeton.edu