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: a mark ¨ placed over a vowel to indicate that the vowel is pronounced in a separate syllable (as in naïve or Brontë) — compare umlaut
: the break in a verse caused by the coincidence of the end of a foot with the end of a word
Resources for dieresis
More from Merriam-Webster on dieresis
Britannica.com: Encyclopedia article about dieresis
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