Spec′tro‐he″li‐o‐gram′ (?), n. [Spectrum + heloi- + -gram.] (Astrophysics) A photograph of the sun made by monochromatic light, usually of the calcium line (k), and showing the sun's faculæ and prominences.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.