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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.