| nut | (noun) a small (usually square or hexagonal) metal block with internal screw thread to be fitted onto a bolt | - |
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| (noun) one of the two male reproductive glands that produce spermatozoa and secrete androgens | Synonyms: ball, ballock, bollock, egg, orchis, testicle, testis |
| (noun) someone who is so ardently devoted to something that it resembles an addiction | Synonyms: addict, freak, junkie, junky |
| (noun) a whimsically eccentric person | Synonyms: crackpot, crank, fruitcake, nut case, screwball |
| (noun) usually large hard-shelled seed | - |
| (noun) half the width of an em | Synonyms: en |
| nutation | (noun) uncontrolled nodding | - |
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| nutcase | (noun) someone deranged and possibly dangerous | Synonyms: crazy, looney, loony, weirdo |
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| nutcracker | (noun) speckled birds that feed on nuts | - |
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| (noun) any of various small short-tailed songbirds with strong feet and a sharp beak that feed on small nuts and insects | Synonyms: nuthatch |
| (noun) a compound lever used to crack nuts open | - |
| nutgrass | (noun) a widely distributed perennial sedge having small edible nutlike tubers | Synonyms: Cyperus rotundus, nut grass, nut sedge, nutsedge |
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| nuthatch | (noun) any of various small short-tailed songbirds with strong feet and a sharp beak that feed on small nuts and insects | Synonyms: nutcracker |
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| nuthouse | (noun) pejorative terms for an insane asylum | Synonyms: Bedlam, booby hatch, crazy house, cuckoo's nest, funny farm, funny house, loony bin, madhouse, nut house, sanatorium, snake pit |
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| nutlet | (noun) a small nut | - |
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| nutmeg | (noun) hard aromatic seed of the nutmeg tree used as spice when grated or ground | - |
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| (noun) East Indian tree widely cultivated in the tropics for its aromatic seed; source of two spices: nutmeg and mace | Synonyms: Myristica fragrans, nutmeg tree |
| 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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| nutsedge | (noun) a widely distributed perennial sedge having small edible nutlike tubers | Synonyms: Cyperus rotundus, nut grass, nut sedge, nutgrass |
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| nutshell | (noun) the shell around the kernel of a nut | - |
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| nutter | (noun) a person who is regarded as eccentric or mad | Synonyms: wacko, whacko |
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