spectral

Adjective
  1. Of or relating to a spectrum (synset 302810955)
    "spectral colors"; "spectral analysis"
  2. Resembling or characteristic of a phantom (synset 301579318)
    "a ghostly face at the window"; "a phantasmal presence in the room"; "spectral emanations"; "spiritual tappings at a seance"
    similar to: supernatural - not existing in nature or subject to explanation according to natural laws; not physical or material
    same as: apparitional, ghostlike, ghostly, phantasmal, spiritual

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