What does "umbilical" mean?

Umbilical: 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.