Medical Definition of root
1a: the usually underground part of a seed plant body that functions as an organ of absorption, aeration, and food storage or as a means of anchorage and support and that differs from a stem especially in lacking nodes, buds, and leavesb: any subterranean plant part (as a true root or a bulb, tuber, rootstock, or other modified stem) especially when fleshy and edible
2a: the part of a tooth within the socket: any of the processes into which the root of a tooth is often dividedb: the enlarged basal part of a hair within the skin—called also hair rootc: the proximal end of a nerve; especially : one or more bundles of nerve fibers joining the cranial and spinal nerves with their respective nuclei and columns of gray matter—see dorsal root, ventral rootd: the part of an organ or physical structure by which it is attached to the body <the root of the tongue>
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