| micronutrient | (noun) a substance needed only in small amounts for normal body function (e.g., vitamins or minerals) | - |
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| nutrient | (noun) any substance that can be metabolized by an animal to give energy and build tissue | Synonyms: food |
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| (noun) any substance (such as a chemical element or inorganic compound) that can be taken in by a green plant and used in organic synthesis | - |
| retrieval | (noun) the act of regaining or saving something lost (or in danger of becoming lost) | Synonyms: recovery |
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| (noun) the cognitive operation of accessing information in memory | - |
| (noun) (computer science) the operation of accessing information from the computer's memory | - |
| retriever | (noun) a dog with heavy water-resistant coat that can be trained to retrieve game | - |
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| triennial | (noun) the 300th anniversary (or the celebration of it) | Synonyms: tercentenary, tercentennial |
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| trier | (noun) one who tries | Synonyms: attempter, essayer |
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| (noun) one (as a judge) who examines and settles a case | - |