Bible Dictionaries
Spectroheliogram
Webster's Dictionary
(n.) A photograph of the sun made by monochromatic light, usually of the calcium line (k), and showing the sun's faculae and prominences.
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Bibliography Information
Webster, Noah. Entry for 'Spectroheliogram'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​s/spectroheliogram.html. 1828.