n.
Pronunciation: ' üm- ˌ lau ̇ t, ' u ̇ m-
Function: noun
Etymology: German, from um- around, transforming + Laut sound
Date: circa 1845
1 a : the change of a vowel (as \ ü \ to \ ē \ in goose, geese ) that is caused by partial assimilation to a succeeding sound or that occurs as a reflex of the former presence of a succeeding sound which has been lost or altered b : a vowel resulting from such partial assimilation
2 : a diacritical mark {uml} placed over a vowel to indicate a more central or front articulation ― compare DIAERESIS