What does Absence of the nipple mean?

Absence of the nipple meaning in Medical Dictionary

Medically known as athelia, this can be a rare condition which will occur with a number of hereditary diseases or chromosomal defects, particularly Poland Syndrome, progeria (premature aging), ectodermal dysplasia, and Yunis-Varon syndrome. Athelia tends to happen on one part (unilaterally) in children using Poland series as well as on both sides (bilaterally) in a few types of ectodermal dysplasia.