| fraunhofer lines | <physics> 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. Source: Websters Dictionary (01 Mar 1998) |
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| Fraunhofer's lines | A number of the most prominent of the absorption line's of the solar spectrum. (05 Mar 2000) |
| Fraunhofer, Joseph von | <person> German optician, 1787-1826. See: Fraunhofer's lines. (05 Mar 2000) |