Definition of Müller's glass in English:
Müller's glass
(also Muller's glass)
noun ˌmʊləz ˈɡlɑːsˌmʊləz ˈɡlas
Mineralogy Origin
Late 18th century; earliest use found in Richard Kirwan (1733–1812), chemist and mineralogist. From the genitive of the German surname Müller, supposedly the name of its discoverer + glass.