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nucleate possessing a nucleus or nuclei. [4 definitions]
nuclei pl. of nucleus.
nucleic acid any of a group of essential, complex acids comprising the genetic material of all living cells; DNA or RNA.
nucleolus a small spherical body in the nucleus of a cell, consisting of protein and RNA.
nucleon a proton or neutron, esp. as a component of an atomic nucleus.
nucleonics (used with a sing. verb) the science or technology having to do with atomic nuclei, esp. with nuclear energy.
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]