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n. pl. syn·i·ze·ses (-sēz)
1. Linguistics The union in pronunciation of two adjacent vowels into one syllable without forming a diphthong.
2. Biology The phase of meiosis in some species in which the chromatin contracts into a mass at one side of the nucleus.
1. (Phonetics & Phonology) phonetics the contraction of two vowels originally belonging to separate syllables into a single syllable, without diphthongization. Compare syneresis
2. (Biology) 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]
syn•i•ze•sis(ˌsɪn əˈzi sɪs)
the combination into one syllable of two vowels (or of a vowel and a diphthong) that do not form a diphthong. Also called syneresis.