noun Phonetics.
the combination into one syllable of two vowels (or of a vowel and a diphthong) that do not form a diphthong.
Also called synaeresis.

1840–50; < Late Latin < Greek synízēsis, equivalent to syn- syn- + (h)iz- (stem of hízein to sit1) + -ēsis -esis Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
synizesis (ˌsɪnɪˈziːsɪs)
1.  phonetics Compare syneresis the contraction of two vowels originally belonging to separate syllables into a single syllable, without diphthongization
2.  cytology the contraction of chromatin towards one side of the nucleus during the prophase of meiosis
[C19: via Late Latin from Greek sunizēsis a collapse, from sunizanein to sink down, from syn- + hizein to sit]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

synizesis syn·i·ze·sis (sĭn'ĭ-zē'sĭs)

  1. Closure or obliteration of the pupil of the eye.

  2. The phase of meiosis in some species in which the chromatin contracts into a mass at one side of the nucleus.

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