um·laut /ˈumˌlaʊt, ˈʊm-/
  母音變音(vt.)使變音
  um·laut n.  Philol. The euphonic modification of a root vowel sound by the influence of a, u, or especially i, in the syllable which formerly followed.
  Note: ☞ It is peculiar to the Teutonic languages, and was common in Anglo-Saxon. In German the umlauted vowels resulting from a, o, u, followed by old i, are written ä, ö, ü, or ae, oe, ue; as, männer or maenner, men, from mann, man. Examples of forms resulting from umlaut in English are geese pl. of goose, men pl. of man, etc.
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  umlaut
       n : a diacritical mark (two dots) placed over a vowel in German
           to indicate a change in sound [syn: dieresis, diaeresis]