Main Entry: non·dis·junc·tion

Pronunciation: \ˌnän-dis-ˈjəŋ(k)-shən\

Function: noun

Etymology: International Scientific Vocabulary

Date: 1913

: failure of homologous chromosomes or sister chromatids to separate subsequent to metaphase in meiosis or mitosis so that one daughter cell has both and the other neither of the chromosomes

— non·dis·junc·tion·al \-shnəl, -shə-n^əl\ adjective