'Spectral' definitions:

Definition of 'spectral'

From: WordNet
adjective
Of or relating to a spectrum; "spectral colors"; "spectral analysis"
adjective
Resembling or characteristic of a phantom; "a ghostly face at the window"; "a phantasmal presence in the room"; "spectral emanations"; "spiritual tappings at a seance" [syn: apparitional, ghostlike, ghostly, phantasmal, spectral, spiritual]

Definition of 'Spectral'

From: GCIDE
  • Spectral \Spec"tral\, a.
  • 1. Of or pertaining to a specter; ghosty. [1913 Webster]
  • He that feels timid at the spectral form of evil is not the man to spread light. --F. W. Robertson. [1913 Webster]
  • 2. (Opt.) Of or pertaining to the spectrum; made by the spectrum; as, spectral colors; spectral analysis. [1913 Webster]
  • Spectral lemur. (Zool.) See Tarsius. [1913 Webster]