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spectral

/ˈspɛktɹəɫ/ adjective

adjective Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about spectral at Wordnik → Where our words come from →

  1. Of or relating to a spectrum.
    spectral colors
  2. Resembling or characteristic of a phantom.
    a ghostly face at the window

Origin

From spectr(e) + -al.

From Wiktionary, via Kaikki.org (CC BY-SA)