Webster's English Dictionary

Enter the word to look up:

umlaut

1. um.laut \'u.m-.lau.t, 'u:m-\ n [G, fr. um- around + laut sound] 1a: the 
   change of a vowel caused by partial assimilation to a succeeding so und; 
   esp : the fronting or raising of a back or low vowel (as a, o, or u) caused 
   by an i or j orig. standing the following syllable but usu. lost or altered 
   1b: a vowel resulting from such partial assimilation  2: a diacritical mark 
   : placed esp. over a German vowel to indicate u mlaut
2. umlaut vt 1: to produce by umlaut  2: to write or print an umlaut over