Root

[Icel., rot, root]. I. The descending axis of a plant. 2. The part of an organ embedded in the ti ues, as, £.£-., the R. of a tooth. R. of a nerve, one of two bundles of nerve fibers, the anterior and posterior roots, joining to form a nerve trunk. R. -sheath, the epithelium of the hair-follicle. R. -zone, a name given to the column of Burdach of the spinal cord. 560