m-lout]
Linguistics| 1. | a mark (¨) used as a diacritic over a vowel, as ä, ö, ü, to indicate a vowel sound different from that of the letter without the diacritic, esp. as so used in German. Compare dieresis. |
| 2. | Also called vowel mutation. (in Germanic languages) assimilation in which a vowel is influenced by a following vowel or semivowel. |
| 3. | to modify by umlaut. |
| 4. | to write an umlaut over. |
