| nanogram | (n) one billionth (1/1, 000, 000, 000) gram, Syn. ng |
| nanometer | (n) a metric unit of length equal to one billionth of a meter, Syn. micromillimeter, nanometre, micromillimetre, nm, millimicron |
| nanomia | (n) 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 |
| nanophthalmos | (n) condition in which both eyes are abnormally small but otherwise normal |
| nanosecond | (n) one billionth (10^-9) of a second; one thousandth of a microsecond |
| nanotechnology | (n) the branch of engineering that deals with things smaller than 100 nanometers (especially with the manipulation of individual molecules) |
| nanovolt | (n) a unit of potential equal to one billionth of a volt |