| nucleophile |
a substance that donates electrons or has an affinity for atomic nuclei. |
| nucleotide |
any of a class of esters on which nucleic acids are based. |
| nucleus |
the central, essential, or highly concentrated part around which other parts are grouped. [4 definitions] |
| nuclide |
a category of atoms, all of which have the same number of protons and neutrons and the same nuclear energy. [2 definitions] |
| nude |
not wearing clothes; naked. [5 definitions] |
| nudge |
to push gently or touch, esp. with the elbow and esp. so as to attract attention. [4 definitions] |
| nudism |
the belief in or the practice of not wearing clothes, esp. with others of both sexes in designated settings. |
| nudity |
the condition or fact of being unclothed; nakedness. |
| nuée ardente |
a thick volcanic cloud that explodes and pours down the sides of a volcano. |
| nugatory |
having little or no real importance or value; trifling. [2 definitions] |
| nugget |
a small, solid lump, esp. of a precious metal such as gold. [2 definitions] |
| nuisance |
someone or something that is annoying or troublesome. |
| nuisance tax |
a tax that is considered to be a nuisance because it is levied on small, separate purchases and paid by the consumer. |
| Nukualofa |
the capital of Tonga. |
| null |
not having any legal force; invalid. [4 definitions] |
| nullification |
the act of nullifying, or the state of being nullified. |
| nullify |
to cause or declare to have no legal force or effect; make null; invalidate. [2 definitions] |
| nullity |
the condition or quality of being or amounting to nothing; nothingness; invalidity. [2 definitions] |
| numb |
not able to feel physical sensation or move normally, esp. because of cold. [3 definitions] |
| numbat |
any of several small Australian marsupials that have no pouch. |
| number |
a mathematical unit that has a fixed value and a fixed position in a series, used in counting. [18 definitions] |