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Noun
1. Fraunhofer lineAstronomy
Wikipedia definition
2. Fraunhofer linesIn physics and optics, the Fraunhofer lines are a set of spectral lines named for the German physicist Joseph von Fraunhofer (1787–1826). The lines were originally observed as dark features in the optical spectrum of the Sun. The English chemist William Hyde Wollaston was in 1802 the first person to note the appearance of a number of dark features in the solar spectrum.
Read “Fraunhofer lines” on English Wikipedia
Read “フラウンホーファー線” on Japanese Wikipedia
Read “Fraunhofer lines” on DBpedia

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