umlaut

n.

1.

(Philol.) The euphonic modification of a root vowel sound by the influence of a, u, or especially i, in the syllable which formerly followed.

Noun

1.

umlaut - a diacritical mark (two dots) placed over a vowel in German to indicate a change in sound Synonyms: diaeresis, dieresis

diacritic, diacritical mark, diaeresis, dieresis