Definition of: umbilical

(um·bil′i·kəl) adjective
1. Pertaining to or situated near the umbilicus.
2. Placed near the navel; central.
—noun
1. A long, flexible tube that serves as a connecting device, conduit for air, power, communication, etc., for an astronaut or aquanaut when outside the craft.
2. A similar device used as a source of fuel, etc., for a spacecraft before launching. [<LL umbilicalis <L umbilicus navel]