a structure found on the inside of the nuclear membrane of female cells that takes a dark stain and indicates by its presence the sex of the individual
Origin:
after M. L. Barr (1908-95), Cdn anatomist
See Barr body in American Heritage Dictionary 4
noun
The condensed, inactive X-chromosome found in the nuclei of somatic cells of most female mammals. Also called sex chromatin.
Origin:
Origin: After Murray Llewellyn Barr (1908-1995), Canadian anatomist