Navel

The navel (clinically known as the umbilicus; : umbilici or umbilicuses; also known as the belly button or tummy button) is a protruding, flat, or hollowed area on the abdomen at the attachment site of the umbilical cord.

conduit between embryo/fetus and the placenta

intestinal disease characterized by the protrusion by part of the intestine though an opening in the abdominal muscles

type of piercing located in, or around, the navel

accumulation of fibers in the navel cavity

sexual fascination with the human navel

palpable nodule bulging into the umbilicus

Meditation by navel-gazing

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.