A cable conveying power to a rocket or spacecraft before liftoff. Also a tethering or supply line for an astronaut outside a spacecraft. Found on http://www.braeunig.us/space/glossary.htm
of, pertaining to, or characteristic of an umbilicus or umbilical cord. · joined together by or as if by an umbilical cord; heavily dependent in a close relationship. · adjacent to or located near the navel; central to the abdomen: the umbilical region. · serving as or containing a conduit through which power is transferred, esp. ... Found on https://www.infoplease.com/dictionary/umbilical