1. A diacritical mark (two dots) placed over a vowel to indicate that it does not form a diphthong with an adjacent vowel
   "The diaeresis in 'naïve' indicates that the 'i' is pronounced separately from the 'a'";
   - dieresis [N. Amer]

Derived forms: diaereses

Type of: diacritic, diacritical mark

Encyclopedia: Diaeresis