A mark consisting of two dots ["], placed over the second of two adjacent vowels, to denote that they are to be pronounced as distinct letters; as, coöperate, aërial.

a diacritical mark (two dots) placed over a vowel in German to indicate a change in sound

a special mark (two small dots) that is placed over the second of two vowels in a word to show that the vowel is pronounced separately

The separation or resolution of one syllable into two; -- the opposite of synæresis.

Same as Diæresis.