spectral

comparative more spectral · superlative most spectral

1. Of, or pertaining to, spectres; ghostly.

   The spectral chain-rattling and moans gave me the chills.

   2 more examples

   The day itself was miserably dull; a thick fog shut out the landscape, while a few of the nearer trees alone were visible, spreading out their thin spectral arms on the murky air.

   1837, L[etitia] E[lizabeth] L[andon], “The Marriage Morning”, in Ethel Churchill: Or, The Two Brides. […], volume I, London: Henry Colburn, […], →OCLC, page 202

   Agitated by a multitude of curious thoughts, I retired to my room, that night, prepared to encounter some new experience of a spectral character.

   1859 December 13, Charles Dickens, “The Ghost in Master B’s Room”, in Charles Dickens, editor, The Haunted House. The Extra Christmas Number of All the Year Round […], volume II, London: […] C[harles] Whiting, […], →OCLC, page 27, column 2

   Synonyms: ghostly · Antonyms: nonspectral, unspectral

comparative more spectral · superlative most spectral

1. Of, or pertaining to, spectra; classified according to frequency or wavelength (of light, etc.).

   Antonyms: nonspectral

2. On the spectrum; spectrumy.