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The Collaborative International Dictionary
Cytococcus

Cytococcus \Cy`to*coc"cus\ (-k?k"k?s), n.; pl. Cytococci (-s?). [NL., fr. Gr. ky`tos hollow vessel + ???? kernel.] (Biol.) The nucleus of the cytula or parent cell.
--H[ae]ckel.

Wiktionary
cytococcus

n. (context biology English) The nucleus of the cytula or parent cell.