spectral

/ˈspɛktɹəɫ/

sifat adjective

Of, or pertaining to, spectres; ghostly. The spectral chain-rattling and moans gave me the chills.
Of, or pertaining to, spectra; classified according to frequency or wavelength (of light etc)

Manbalar: Wiktionary (Free Dictionary API orqali), Datamuse, Tatoeba (CC BY 2.0 FR), MyMemory.