| 1. | the contraction of two syllables or two vowels into one, esp. the contraction of two vowels so as to form a diphthong. |
| 2. | synizesis. |
| the combination into one syllable of two vowels (or of a vowel and a diphthong) that do not form a diphthong. |
synizesis syn·i·ze·sis (sĭn'ĭ-zē'sĭs)
n.
Closure or obliteration of the pupil of the eye.
The phase of meiosis in some species in which the chromatin contracts into a mass at one side of the nucleus.