Noun
endomitosis (usually uncountable, plural endomitoses)
(biology) A type of cell cycle variation where mitosis is initiated, but some of the processes of mitosis are not completed. This will give rise to either a mononucleated or binucleated polyploid cell. Not to be confused with endoreplication.
Endomitosis is a variant of endoreduplication in which cells replicate their chromosomes during S phase and enter, but prematurely terminate, mitosis. Source: Internet