Spec″tro‐phone (?), n. [Spectrum + Gr. � sound.] An instrument constructed on the principle of the photophone and used in spectrum analysis as an adjunct to the spectroscope. — Spec′tro‐phon″ic (#), a.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.