Definition of dieresis noun from the Oxford Advanced American Dictionary

 

dieresis

 noun
noun
NAmE//daɪˈɛrəsəs//
 
(pl. diereses
NAmE//daɪˈɛrəsiz//
 
)
(technology)
 
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the mark placed over a vowel to show that it is pronounced separately, as in naïve