diaeresis
/daɪˈɪərɪsɪs/( <美> dieresis)
noun
(pl. diaeresises /-siːz/ )
1
- a mark (¨) placed over a vowel to indicate that it is sounded separately, as in naïve, Brontë,分音符, 隔音符（符号[¨], 置于元音上方, 表示该元音单独发音, 如在naïve, Brontë中）。
1.1
- mass noun the division of a sound into two syllables, especially by sounding a diphthong as two vowels二合元音分立（将一个音分成两个音节, 尤指将一二合元音分别发成两个元音）。
2
- Prosody a natural rhythmic break in a line of verse where the end of a metrical foot coincides with the end of a phrase【诗韵】（诗行中音步尾部和词组的最后音节相符时的）小休止。
词源
late 16th cent. (denoting the division of one syllable into two)： via Latin from Greek diairesis separation， from diairein 'take apart'， from dia 'apart' + hairein 'take'.