Definition of umlaut noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈʊmlaʊt//
; NAmE NAmE//ˈʊmlaʊt//
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the mark placed over a vowel in some languages to show how it should be pronounced, as over the u in the German word für compare acute accent, circumflex, grave2, tilde Word Originmid 19th cent.: from German Umlaut, from um ‘about’ + Laut ‘sound’.
See the Oxford Advanced American Dictionary entry: umlaut