Fräulein ( FROY-lyne, German: [ˈfʁɔʏlaɪn] ) is the German language honorific for unmarried women, comparable to Miss in English and Mademoiselle in French. Description. Fräulein is the diminutive form of Frau, which was previously reserved only for married women. . Frau is in origin the equivalent of "My lady" or "Madam", a form of address of a noblewoman. But by an ongoing process of devaluation of honorifics, it came to be used as the unmarked term for "woman" by about 1800.
https://en.wikipedia.org/wiki/Fr%C3%A4ulein