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The Collaborative International Dictionary of English v.0.48:

Spectrograph \Spec"tro*graph\, n. [Spectrum + graph.] (Physics)
   (a) An apparatus for photographing or mapping a spectrum.
   (b) A photograph or picture of a spectrum. --
       Spec`tro*graph"ic, a. -- Spec`tro*graph"ic*al*ly,
       adv. -- Spec*trog"ra*phy, n.
       [Webster 1913 Suppl.]