Definitions from Wiktionary (umbilical)

▸ adjective:  Of, or relating to, the navel (umbilicus) or the umbilical cord.
▸ adjective:  (mathematics) Such that the curvatures of normal sections are all equal to each other.
▸ noun:  (astronautics) A cord connecting an astronaut to a spacecraft, or a craft to ground control prior to launch, etc.

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