Joseph von (ˈjoːzɛf fɔn). 1787–1826, German physicist and optician, who investigated spectra of the sun, planets, and fixed stars, and improved telescopes and other optical instruments
Fraunhofer in American English
(ˈfraunˌhoufər, ˈfrauənˌhɑfər, for 1 also German ˈfʀaunˌhoufəʀ)
noun
Joseph von (ˈdʒouzəf vɑn, -səf, German ˈjouzef fən), 1787–1826, German optician and physicist