Your umbilicus is your bellybutton. It's the place on your stomach where your umbilical cord was attached before you were born. Just call it a bellybutton or navel unless you're a fancy medical writer.

Umbilicus is the official anatomical term for your navel or bellybutton. Most people don't give much thought to their umbilicus, which is really a scar marking the spot where a cord once connected to your source of nutrients when you were a fetus in your mother's body. After babies are born, this cord is cut, and the result is an umbilicus. In Latin, the word means both "navel" and "the center."

Definitions of umbilicus
  1. noun
    a scar where the umbilical cord was attached
    synonyms: belly button, bellybutton, navel, omphalos, omphalus
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    type of:
    the precise location of something; a spatially limited location
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