'Fraunhofer lines' definitions:
Definition of 'Fraunhofer lines'
From: GCIDE
- Fraunhofer lines \Fraun"ho*fer lines`\prop. n. pl.. (Physics.) The lines of the spectrum; especially and properly, the dark lines of the solar spectrum, so called because first accurately observed and interpreted by Fraunhofer, a German physicist. [1913 Webster]