noun[mass noun] Biology
Material found only in the nuclei of female cells (especially as the Barr body) and believed to represent the inactivated X chromosome.
More example sentences
- The incidence of sex chromatin in nuclei of epithelial cells in buccal smears was determined in 63 women aged 62 to 93 who had reached the menopause from 10 to 50 years previously.
Definition of sex chromatin in:
- The US English dictionary