Crossword clue: an obliteration of the pupil of the eye. 2. (gram.) a contraction of two syllables into one; synecphonesis.
1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
the contraction of chromatin towards one side of the nucleus during the prophase of meiosis