Wiktionary
umbilicoplasty
n. A plastic surgery procedure to modify the appearance of the navel.
Wikipedia
Umbilicoplasty
Umbilicoplasty, sometimes referred to as "belly button surgery", is a plastic surgery procedure to modify the appearance of one's navel (or "belly button"). It may be performed as part of a tummy tuck or lower body lift operation, or it may be performed alone.