spectral

relating to spirits or ghosts; ghostly

espectral, fantasmal

• a spectral figure/shape

Collocations spectral apparition · spectral presence

• She saw a spectral figure in the dark.

  Vio una figura espectral en la oscuridad.

relating to or using spectra, especially in physics and chemistry

espectroscópico, relativo a espectros

• spectral analysis

Collocations spectral line · spectral signature

• The spectral lines of the element were analyzed.

  Se analizaron las líneas espectrales del elemento.