1. (in dentistry) That part of a tooth covered by cementum and not covered by enamel (anatomical root). An accessory root is a supplemental root differing in size, shape, and direction from the principal root. The clinical root is that portion of the root which is attached by the periodontal ligament to the alveolar bone. A retained root is a tooth root or part of a tooth root remaining in the alveolar bone or soft tissue following trauma, extraction, or extensive caries; it may be intentionally retained to prevent alveolar bone resorption or to use for the retention of a crown, bridge, or removable denture.
2. (in neurology) A nerve at its emergence from the spinal cord.
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