umlaut /ŭmˈlowt/

1. A vowel change in Germanic languages brought about by a vowel or semivowel (esp i or j, usu now lost) in the following syllable
2. The diacritical sign (¨), dots placed over a vowel, indicating such a modification

To modify (a vowel) with an umlaut

• titter
• tittered
• titterer
• titterers
• tittering
• titteringly
• titterings
• titters
• titties
• titting
• tittish
• tittivate
• tittivated
• tittivates
• tittivating
• tittivation
• tittivations
• tittle
• tittlebat
• tittlebats
• tittled
• tittles
• tittle-tattle
• tittle-tattled
• tittle-tattler