Spec·tral a.
 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. Opt. Of or pertaining to the spectrum; made by the spectrum; as, spectral colors; spectral analysis.
 Spectral lemur. Zool. See Tarsius.

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 Tar·si·us n.  Zool. A genus of nocturnal lemurine mammals having very large eyes and ears, a long tail, and very long proximal tarsal bones; -- called also malmag, spectral lemur, podji, and tarsier.

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