Source : Webster's Revised Unabridged Dictionary (1913)

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.