In medicine, anything having to do with the belly button or the cord that connects a newborn baby's navel to the placenta is umbilical.

One thing all prenatal mammals have in common is an umbilical cord attached to a placenta. It's how they receive nutrients and eliminate waste before they're born. Evidence of your umbilical cord is your navel, or belly button. Whenever you see the adjective umbilical, you know it either has to do with that cord, or figuratively, someone or something extremely close or connected: "Her relationship with her best friend is umbilical."

Definitions of umbilical
  1. adjective
    relating to or resembling the umbilicus
    umbilical cord”
  2. noun
    membranous duct connecting the fetus with the placenta
    synonyms: umbilical cord
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    type of:
    canal, channel, duct, epithelial duct
    a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance
    any of several body structure resembling a cord
    fetal membrane
    any membrane that functions for the protection or nourishment or respiration or excretion of a developing fetus
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