diaeresis diaereses • diaeretic · · · Info · Definitions · Synonyms · Characters · · diaeresis · · Text Latin · · Script 9 · · Length Definitions · · · (noun) a diacritical mark (two dots) placed over a vowel in German to indicate a change in sound. Synonyms: umlaut, dieresis. · · Noun Definition 1 Synonyms · · · umlaut · · Synonym 1 dieresis · · Synonym 2 Characters · · a latin small letter a U+0061 d latin small letter d U+0064 e latin small letter e U+0065 i latin small letter i U+0069 r latin small letter r U+0072 s latin small letter s U+0073