Synizesis

·noun An obliteration of the pupil of the eye.

II. Synizesis ·noun A contraction of two syllables into one; synecphonesis.

synizesis
synīzēsis, is, f., = συνίζησις, a contraction of two vowels into one syllable , Serv. Verg. A. 1, ...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.