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From The Collaborative International Dictionary of English v.0.48:
Umbilical \Um*bil"ic*al\, a. [Cf. F. ombilical. See Umbilic, n.] 1. (Anat.) Of or pertaining to an umbilicus, or umbilical cord; umbilic. [1913 Webster] 2. Pertaining to the center; central. [R.] --DeFoe. [1913 Webster] 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. [1913 Webster] Umbilicate