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

• oppilating
• oppilation
• oppilations
• oppilative
• oppo
• opponencies
• opponency
• opponent
• opponents
• opportune
• opportunely
• opportuneness
• opportunenesses
• opportunism
• opportunisms
• opportunist
• opportunistic
• opportunistic infection
• opportunistic infections
• opportunistic species
• opportunists
• opportunities
• opportunity
• opportunity cost
• opportunity costs