spectral
/ˈspɛktɹəɫ/ adjective C2- Of, or pertaining to, spectra; classified according to frequency or wavelength (of light, etc.).
- On the spectrum; spectrumy.
From the library
They all agreed that it was a huge creature, luminous, ghastly, and spectral.
Or a spectral hound, black, silent, and monstrous?
A spectral hound which leaves material footmarks and fills the air with its howling is surely not to be thought of.
He remained a spectral presence, an amalgamation of brilliant ideas and perplexing syntactic choices hovering just beyond her complete comprehension.
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