chro·mo·ne·ma 
(krō′mə-nēmə)
(krō′mə-nēmə)n. pl. chro·mo·ne·ma·ta (-mə-tə)
The spirally coiled central filament of a chromatid along which the chromomeres are aligned.
[CHROMO(SOME) + Greek nēma, thread; see (s)nē- in the Appendix of Indo-European roots.]
chro′mo·ne·matic (-nə-mătĭk), chro′mo·nemic (-nēmĭk) adj.