dieresis
🇺🇸
/daɪˈerəsɪs/
🇬🇧
/daɪˈerəsɪs/
A punctuation mark (¨) placed over a vowel to indicate that it is pronounced separately from a preceding vowel, as in the word 'naïve'.
The word 'coöperate' contains a diaeresis to show that the 'o' is pronounced separately from the 'oe'.
'coöperate'という単語には、'o'が'oe'とは別に発音されることを示すためにダイアレシスがあります。