spectral

/ˈspɛktrəl/
adjective
  1. Of or like a ghost; ghostly in appearance or effect.
    • She heard a spectral whisper echoing through the empty hall.
    • A spectral figure appeared at the window, glowing faintly in the moonlight.
    • The abandoned hospital had a spectral atmosphere that made visitors uneasy.
  2. Relating to or using a spectrum of light or other radiation.
    • Spectral imaging can reveal details invisible to the naked eye.
    • The telescope captured spectral data from distant galaxies.
    • Scientists used spectral analysis to identify the elements in the star.
Antonyms
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