Meaning of the word dieresis in English

What does dieresis mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

dieresis

US /daɪˈer.ə.sɪs/
UK /daɪˈer.ə.sɪs/

Noun

a mark (¨) placed over a vowel to indicate that it is sounded in a separate syllable, as in naïve or Brontë

Example:
The word 'naïve' uses a dieresis over the 'i' to show it's pronounced separately.
Some style guides recommend using a dieresis for certain foreign words.