01 n. The separation or resolution of one syllable into two; -- the opposite of synæresis.
pl.
Diæreses, Diereses ((#))
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1.
The separation or resolution of one syllable into two; -- the opposite of synæresis.(Gram.)
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2.
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.