| antineutrino | (noun) the antiparticle of a neutrino | - |
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| executrix | (noun) a woman executor | - |
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| malnutrition | (noun) a state of poor nutrition; can result from insufficient or excessive or unbalanced diet or from inability to absorb foods | - |
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| micronutrient | (noun) a substance needed only in small amounts for normal body function (e.g., vitamins or minerals) | - |
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| neutrino | (noun) an elementary, electrically neutral particle with a very small mass | - |
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| nutria | (noun) aquatic South American rodent resembling a small beaver; bred for its fur | Synonyms: coypu, Myocastor coypus |
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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 | - |
| nutriment | (noun) a source of materials to nourish the body | Synonyms: aliment, alimentation, nourishment, nutrition, sustenance, victuals |
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| nutrition | (noun) the scientific study of food and drink (especially in humans) | - |
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| (noun) a source of materials to nourish the body | Synonyms: aliment, alimentation, nourishment, nutriment, sustenance, victuals |
| (noun) (physiology) the organic process of nourishing or being nourished; the processes by which an organism assimilates food and uses it for growth and maintenance | - |
| nutritionist | (noun) a specialist in the study of nutrition | - |
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| nutritiousness | (noun) the quality of being nourishing and promoting healthy growth | Synonyms: nutritiveness |
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| nutritiveness | (noun) the quality of being nourishing and promoting healthy growth | Synonyms: nutritiousness |
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| outrider | (noun) an escort who rides ahead (as a member of the vanguard) | - |
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| outrigger | (noun) a stabilizer for a canoe; spars attach to a shaped log or float parallel to the hull | - |
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| putridity | (noun) the state of being putrid | - |
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| putridness | (noun) in a state of progressive putrefaction | Synonyms: corruption, putrescence, rottenness |
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| utricle | (noun) a small pouch into which the semicircular canals open | Synonyms: utriculus |
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| utriculus | (noun) a small pouch into which the semicircular canals open | Synonyms: utricle |
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