IPA: /ˌdaɪəˈrɛsɪs/
KK: /daɪˈrɛsɪs/
A symbol placed over a vowel to show that it should be pronounced separately from an adjacent vowel, or to indicate that a vowel is not silent.
In the word 'naïve', the dieresis shows that the 'i' and 'e' are pronounced as separate sounds.
Dieresis → It is formed from "dia-" (meaning through or across) and "eresis" (from Greek "airesis", meaning taking or choice). The term refers to the act of separating or distinguishing, particularly in phonetics where it indicates the separation of two adjacent vowels.
Think of 'taking' or 'choosing' ('airesis') something 'through' ('dia-') — this helps you remember that 'dieresis' involves distinguishing or separating sounds.