Source : Webster's Revised Unabridged Dictionary (1913)

Karyostenosis \Kar`y*o*ste*no"sis\, n. [NL., fr. Gr. ? a nut,
   kernel + ? a being straitened.] (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
   karyostenotic mode of nuclear division.