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