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Fraunhofer lines

plural noun, Astronomy.
the dark lines of the solar spectrum.
Origin of Fraunhofer lines
First recorded in 1830-40; named after J. von Fraunhofer Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for Fraunhofer lines

Fraunhofer lines

/German ˈfraunhoːfər/
plural noun
a set of dark lines appearing in the continuous emission spectrum of the sun. It is caused by the absorption of light of certain wavelengths coming from the hotter region of the sun by elements in the cooler outer atmosphere
Word Origin
named after J. von Fraunhofer (1787–1826), German physicist
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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