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dieresis

or di·aer·e·sis

[dahy-er-uh-sis]
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noun, plural di·er·e·ses [dahy-er-uh-seez] /daɪˈɛr əˌsiz/.
  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.
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Origin of dieresis

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
Related formsdi·e·ret·ic [dahy-uh-ret-ik] /ˌdaɪ əˈrɛt ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for dieretic

dieresis

noun plural -ses (-ˌsiːz)
  1. a variant spelling of diaeresis
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Derived Formsdieretic (ˌdaɪəˈrɛtɪk), adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for dieretic

dieresis

n.

also diaeresis, 1610s, "sign marking the division of a diphthong into two simple sounds," from Late Latin diaeresis, from Greek diairesis "division," noun of action from diairein "to divide, separate," from dia- "apart" (see dia-) + hairein "to take" (see heresy).

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Online Etymology Dictionary, © 2010 Douglas Harper

dieretic in Medicine

dieretic

(dī′ə-rĕtĭk)
adj.
  1. Of or relating to dieresis.
  2. Dividing; ulcerating; corroding.
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dieresis

(dī-ĕrĭ-sĭs)
n.
  1. solution of continuity