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, especially to a unit that will be or is designed to be ultimately self-sufficient or independent: an umbilical cable for launching a rocket; an umbilical plug for starting jet engines.

1535–45; < Medieval Latin umbilīcālis, equivalent to Latin umbilīc(us) (see umbilicus) + -ālis -al1

umbilically, adverb
nonumbilical, adjective
postumbilical, adjective
subumbilical, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
umbilical (ʌmˈbɪlɪkəl, ˌʌmbɪˈlaɪkəl)
1.  of, relating to, or resembling the umbilicus or the umbilical cord
2.  in the region of the umbilicus: an umbilical hernia
3.  short for umbilical cord

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"pertaining to the navel," 1540s, from M.L. umbilicalis "of the navel," from L. umbilicus "navel," from PIE *onobh- (source of Gk. omphalos and related to *nobh, source of navel). First record of umbilical cord is from 1753. Umbilicus for "navel" is attested from 1690s but
mostly is confined to medical writing.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

umbilical um·bil·i·cal (ŭm-bĭl'ĭ-kəl)

  1. Of or relating to the navel.

  2. Relating to the umbilical region of the abdomen.

um·bil'i·cal·ly adv.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Around his neck he wears an umbilical cord tied in a hangman's knot.
Power from all the joints is fed down a single umbilical cable to a junction on
  the seabed.
Umbilical cords are being preserved against future, personal need.
Charge comes via an electrical umbilical cord, ie the parent galaxies nuclear
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