karyostenosis

from The Century Dictionary.

• noun Amitosis, akinesia, or direct cell-division, as distinguished from mitosis or karvokinesis: so called because the nucleus divides by simple constriction without forming a spindle. See amitosis, with cut.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Biol.) Direct cell division (in which there is first a simple division of the nucleus, without any changes in its structure, followed by division of the protoplasm of the cell); -- in opposition to karyokinesis.