dieresis (noun)

1. In the novel, the author used a dieresis above the letter 'u' to indicate a change in pronunciation, giving it a poetic touch.

2. According to Greek mythology, the dieresis was believed to have been created by Zeus as a way to alter the sound of vowels in certain words.

3. In the heartfelt love letter, the writer employed a dieresis over the vowels to express the tenderness and depth of their emotions.

4. As the old book was being read out loud, the ominous ritual chant required the use of a dieresis over an ancient vowel to invoke the terrifying presence.