SPECTRAL

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