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.]

Moby Thesaurus II by Grady Ward, 1.0:

24 Moby Thesaurus words for "spectrograph":
   Cassegrainian telescope, Newtonian telescope, OAO, OSO,
   astronomical observatory, astronomical telescope, coelostat,
   coronagraph, coronograph, heliostat, observatory, orrery,
   planetarium, radar telescope, radio observatory, radio telescope,
   reflector, refractor, spectrogram, spectroheliogram,
   spectroheliograph, spectrohelioscope, spectroscope, telescope