karyosome

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. An irregular aggregation of chromatin in the nucleus of a cell not undergoing mitosis.

Century Dictionary and Cyclopedia

1. n. A nucleolus-like mass of chromatin in the cell-nucleus: distinguished from the plasmosome, or true nucleolus.
2. n. A chromosome.
3. n. A micronucleus of the Infusoria.