dieresis

[dahy-er-uh-sis]
noun, plural diereses [dahy-er-uh-seez] .
1.
the separation of two adjacent vowels, dividing one syllable into two.
2.
a sign (¨) placed over the second of two adjacent vowels to indicate separate pronunciation, as in one spelling of the older forms naïve and coöperate: no longer widely used in English.
3.
Prosody. the division made in a line or verse by coincidence of the end of a foot and the end of a word.
Also, diaeresis.


Origin:
1605–15; < Latin diaeresis < Greek diaíresis literally, distinction, division, equivalent to diaire-, stem of diaireîn to divide (di- di-3 + haireîn to take) + -sis -sis

dieretic [dahy-uh-ret-ik] , adjective
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World English Dictionary
diaeresis or dieresis (daɪˈɛrɪsɪs)
 
n , pl -ses
1.  the mark ¨, in writing placed over the second of two adjacent vowels to indicate that it is to be pronounced separately rather than forming a diphthong with the first, as in some spellings of coöperate, naïve, etc
2.  Compare umlaut this mark used for any other purpose, such as to indicate that a special pronunciation is appropriate to a particular vowel
3.  a pause in a line of verse occurring when the end of a foot coincides with the end of a word
 
[C17: from Latin diarēsis, from Greek diairesis a division, from diairein, from dia- + hairein to take; compare heresy]
 
dieresis or dieresis (daɪˈɛrɪsɪs, -ˌsiːz)
 
n
 
[C17: from Latin diarēsis, from Greek diairesis a division, from diairein, from dia- + hairein to take; compare heresy]
 
diaeretic or dieresis
 
adj
 
dieretic or dieresis
 
adj

dieresis (daɪˈɛrɪsɪs)
 
n , pl -ses
a variant spelling of diaeresis
 
dieretic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

dieresis
1611, from L.L. diæresis, from Gk. diairesis "division," from diairein "to divide, separate," from dia- "apart" + hairein "to take."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

dieresis di·er·e·sis (dī-ěr'ĭ-sĭs)
n.
See solution of continuity.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica
Encyclopedia

dieresis

(from Greek diairein, "to divide"), the resolution of one syllable into two, especially by separating the vowel elements of a diphthong and, by extension, two adjacent vowels, as in the word cooperation; it is also the mark placed over a vowel to indicate that it is pronounced as a separate syllable. In classical prosody, diaeresis refers to the end of a word coinciding with the completion of the metrical foot, in contrast to caesura, which refers to a word ending within a metrical foot

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Ketone-induced dieresis occurs, accompanied by loss of magnesium, phosphorus and calcium.
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