| nanocephaly | (noun) an abnormally small head and underdeveloped brain | Synonyms: microcephalus, microcephaly |
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| nanogram | (noun) one billionth (1/1,000,000,000) gram | Synonyms: ng |
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| nanomachine | (noun) a machine of the size of close to one nanometre | - |
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| nanometer | (noun) a metric unit of length equal to one billionth of a meter | Synonyms: micromillimeter, micromillimetre, millimicron, nanometre, nm |
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| nanometre | (noun) a metric unit of length equal to one billionth of a meter | Synonyms: micromillimeter, micromillimetre, millimicron, nanometer, nm |
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| nanomia | (noun) small creatures resembling pieces of fuzzy rope; each with a cluster of swimming bells serving as the head and long elastic tentacles for drawing in prey | - |
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| nanophthalmos | (noun) condition in which both eyes are abnormally small but otherwise normal | - |
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| nanoplankton | (noun) microscopic organisms found in plankton | - |
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| nanosecond | (noun) one billionth (10^-9) of a second; one thousandth of a microsecond | - |
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| nanotechnology | (noun) the branch of engineering that deals with things smaller than 100 nanometers (especially with the manipulation of individual molecules) | - |
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| nanotube | (noun) a fullerene molecule having a cylindrical or toroidal shape | Synonyms: carbon nanotube |
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| nanovolt | (noun) a unit of potential equal to one billionth of a volt | - |
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