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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Spectroheliogram \Spec'tro*he"li*o*gram'\, noun [Spectrum + heloi- + -gram.] (Astrophysics) A photograph of the sun made by monochromatic light, usually of the calcium line (k), and showing the sun's facul[ae] and prominences. [Webster 1913 Suppl.]
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