| root | (noun) the embedded part of a bodily structure such as a tooth, nail, or hair | - |
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| (noun) (linguistics) the form of a word after all affixes are removed | Synonyms: base, radical, root word, stem, theme |
| (noun) a simple form inferred as the common basis from which related words in several languages can be derived by linguistic processes | Synonyms: etymon |
| (noun) the set of values that give a true statement when substituted into an equation | Synonyms: solution |
| (noun) the place where something begins, where it springs into being | Synonyms: beginning, origin, rootage, source |
| (noun) someone from whom you are descended (but usually more remote than a grandparent) | Synonyms: ancestor, antecedent, ascendant, ascendent |
| (noun) (botany) the usually underground organ that lacks buds or leaves or nodes; absorbs water and mineral salts; usually it anchors the plant to the ground | - |
| (noun) a number that, when multiplied by itself some number of times, equals a given number | - |
| (verb) take root and begin to grow | - |
| (verb) cause to take roots | - |
| (verb) become settled or established and stable in one's residence or life style | Synonyms: settle, settle down, steady down, take root |
| (verb) dig with the snout | Synonyms: rootle, rout |
| (verb) plant by the roots | - |
| (verb) cheer for | - |
| (verb) come into existence, originate | - |
| rootage | (noun) the place where something begins, where it springs into being | Synonyms: beginning, origin, root, source |
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| (noun) a developed system of roots | Synonyms: root system |
| (noun) fixedness by or as if by roots | - |
| rootbound | (adjective) having the roots matted or densely tangled | - |
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| (adjective) (of a potted plant) grown too large for its container resulting in matting or tangling of the roots | Synonyms: potbound |
| rooted | (adjective) absolutely still | Synonyms: frozen, stock-still |
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| rooter | (noun) an enthusiastic devotee of sports | Synonyms: fan, sports fan |
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| rooting | (noun) the process of putting forth roots and beginning to grow | - |
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| rootle | (verb) dig with the snout | Synonyms: root, rout |
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| rootless | (adjective) wandering aimlessly without ties to a place or community | Synonyms: vagabond |
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| rootlet | (noun) small root or division of a root | - |
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| roots | (noun) the condition of belonging to a particular place or group by virtue of social or ethnic or cultural lineage | - |
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| rootstalk | (noun) a horizontal plant stem with shoots above and roots below serving as a reproductive structure | Synonyms: rhizome, rootstock |
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| rootstock | (noun) root or part of a root used for plant propagation; especially that part of a grafted plant that supplies the roots | - |
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| (noun) a horizontal plant stem with shoots above and roots below serving as a reproductive structure | Synonyms: rhizome, rootstalk |