Source : Webster's Revised Unabridged Dictionary (1913)

Umbilical \Um*bil"ic*al\, a. [Cf. F. ombilical. See {Umbilic},
   n.]
   1. (Anat.) Of or pertaining to an umbilicus, or umbilical
      cord; umbilic.

   2. Pertaining to the center; central. [R.] --De Foe.

   {Umbilical cord}.
      (a) (Anat.) The cord which connects the fetus with the
          placenta, and contains the arteries and the vein
          through which blood circulates between the fetus and
          the placenta; the navel-string.
      (b) (Bot.) The little stem by which the seeds are attached
          to the placenta; -- called also {funicular cord}.

   {Umbilical hernia} (Med.), hernia of the bowels at the
      umbilicus.

   {Umbilical point} (Geom.), an umbilicus. See {Umbilicus}, 5.
      

   {Umbilical region} (Anat.), the middle region of the abdomen,
      bounded above by the epigastric region, below by the
      hypogastric region, and on the sides by the lumbar
      regions.

   {Umbilical vesicle} (Anat.), a saccular appendage of the
      developing embryo, containing the nutritive and
      unsegmented part of the ovum; the yolk sac. See Illust. in
      Appendix.

Source : WordNet®

umbilical cord
     n : membranous duct connecting the fetus with the placenta