Bible Dictionaries
Fraunhofer Lines
Webster's Dictionary
The lines of the spectrun; especially and properly, the dark lines of the solar spectrum, so called because first accurately observed and interpreted by Fraunhofer, a German physicist.
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Bibliography Information
Webster, Noah. Entry for 'Fraunhofer Lines'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/f/fraunhofer-lines.html. 1828.