spectral

• IPA^(key): /ˈspɛktɹəɫ/

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From spectr(e) +‎ -al.^[1]

spectral (comparative more spectral, superlative most spectral)

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

   Synonym: ghostly

   Antonyms: nonspectral, unspectral

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

   • 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:

     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.

   • 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:

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

From spectr(um) +‎ -al.^[1]

spectral (comparative more spectral, superlative most spectral)

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

   Antonym: nonspectral

2. On the spectrum; spectrumy.

• cepstral, craplets, sceptral

From spectre +‎ -al.

• IPA^(key): /spɛk.tʁal/

spectral (feminine spectrale, masculine plural spectraux, feminine plural spectrales)

1. spectral

• “spectral”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012

Borrowed from French spectral. By surface analysis, spectru +‎ -al.

• IPA^(key): [spekˈtral]

spectral m or n (feminine singular spectrală, masculine plural spectrali, feminine/neuter plural spectrale)

1. spectral

   Synonym: fantomatic

• spectru