![barr body barr body](https://www.tekportal.net/wp-content/uploads/2019/01/barr-body-9661.jpg)
noun
- a condensed, inactivated X chromosome present in most female mammals in the nuclei of all cells except the germ cells: used, as in sports competitions, to verify that an individual is genetically female.
n.
- The condensed, inactive, single X-chromosome found in the nuclei of somatic cells of most female mammals and whose presence is the basis of sex determination tests that are performed, for example, on athletes.sex chromatin