Webster's English Dictionary

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spectral

spec.tral \'spek-tr*l\ \spek-'tral-*t-e-\ \'spek-tr*-le-\ \'spek-tr*l-n*s\ 
   aj 1: of, relating to, or suggesting a specter : GHOSTLY  2: of, relating 
   to, or made by a spectrum  - spec.tral.i.ty n