- The primary or beginning portion of any part, as of a nerve at its origin from the brainstem or spinal cord.
- The descending underground portion of a plant; it absorbs water and nutrients, provides support, and stores nutrients.
- Loosely used to denote the etiology of a process, event, or conflict requiring solutions to allow mitigation. For roots of pharmacologic significance that are not listed below, see specific names.
Synonym(s): root of tooth
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Examples: glitazone, GI cocktail, etc.