Spec′tro‐pho‐tom″e‐try (?), n. The art of comparing, photometrically, the brightness of two spectra, wave length by wave length; the use of the spectrophotometer. — Spec′tro‐pho′to‐met″ric (#), a.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.