Fraunhofer lines Hear it!

Fraunhofer lines definition

Fraun·ho·fer lines (fro̵un′hō′fər)

the dark lines visible in the spectrum of the sun or a star

Etymology: after Joseph von Fraunhofer (1787-1826), Bavarian optician, who first mapped them accurately

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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