Fraunhofer lines
noun plural
Fraun·ho·fer lines
ˈfrau̇n-ˌhōf-ər- 
: the dark lines in the spectrum of sunlight
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“Fraunhofer lines.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/Fraunhofer%20lines. Accessed 23 Apr. 2024.
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