synizesis

from WordNet (r) 3.0 (2006)

synizesis
    n 1: the contraction of chromatin towards one side of the
         nucleus during the prophase of meiosis [syn: {synizesis},
         {synezesis}]

from The Collaborative International Dictionary of English v.0.48

Synizesis \Syn`i*ze"sis\, n. [L., fr. Gr. ?, fr. ? to sit
   together; sy`n with + ? to sit.]
   1. (Med.) An obliteration of the pupil of the eye.
      [1913 Webster]

   2. (Gram.) A contraction of two syllables into one;
      synecphonesis.
      [1913 Webster]