| N |
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noun
- The fourteenth letter of the Appendix:Roman script, English alphabet, preceded by M and followed by O.
abbreviation
- (military) Navy
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| neper |
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noun
- A unit of attenuation used in transmission line theory; equivalent to 8.686 dB.
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| neutrino |
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noun (plural neutrinos)
- (particles) An elementary particle that is classified as a lepton, and has an extremely small but nonzero mass and no electric charge. It interacts with the surroundings only via the weak force or gravitation, making it very difficult to detect.
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| neutron |
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noun
- (particles) A subatomic particle forming part of the nucleus of an atom and having no charge; it is a combination of an up quark and two down quarks
- Symbol: n
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| Newton |
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noun , (plural: Newton)
- newton (unit of measure)
proper noun
- The name of many English places, from the Old English new settlement
- An English habitational surname for someone from any of these places
- w:Isaac Newton, Sir Isaac Newton, English physicist, mathematician, astronomer, alchemist, and natural philosopher
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| Newtonian mechanics |
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noun
- (physics) early classical mechanics as propounded by w:Isaac Newton, Isaac Newton, especially that based on his laws of motion and theory of gravity
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| node |
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noun (plural nodes)
- A knot, a knob; a protuberance; a swelling.
- (Astronomy) The point where the orbit of a planet, as viewed from the sun, intersects the ecliptic. The ascending and descending nodes refer respetively to the points where the planet moves from S to N and N to S. The respective symbols are � and �.
- The joint of a stem, or the part where a leaf or several leaves are inserted.
- A hole in the gnomon of a dial, through which passes the ray of light which marks the hour of the day, the parallels of the sun's declination, his place in the ecliptic, etc.
- (geometry) The point at which a curve crosses itself, being a double point of the curve. See Crunode, and Acnode.
- The point at which the lines of a funicular machine meet from different angular directions; -- called also knot.
- The knot, intrigue, or plot of a piece.
- A hard concretion or incrustation which forms upon bones attacked with rheumatism, gout, or syphilis; sometimes also, a swelling in the neighborhood of a joint.
- One of the fixed points of a sonorous string, when it vibrates by aliquot parts, and produces the harmonic tones; nodal line or point.
- A swelling.
- (graphtheory) A vertex of a graph.
- (computing_theory) (context, computer networking) A vertex or a leaf in a graph of a network; a computer or other device attached to a network
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| nonconductor |
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noun
- any material that does not conduct electricity; a dielectric
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| nonflammable |
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adjective
- Not combustable.
- Not easily set on fire.
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| NT |
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initialism
- (stock symbol) w:Nortel, Nortel
- Northern Territory (of Australia)
- Northwest Territories (Canada)
- New Testament (Bible)
- New Territories (of Hong Kong)
- neurotensin
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| nuclear fission |
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noun
- (physics) a nuclear reaction in which a large nucleus splits into smaller ones with the simultaneous release of energy
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| nuclear fusion |
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noun - (physics) The combining of the nuclei of small atoms to form the nuclei of larger ones, with a resulting release of large quantities of energy; the process that makes the sun shine, and hydrogen bomb explode.
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| nuclear magnetic resonance |
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noun (abbreviated as NMR)
- (physics) The absorption of electromagnetic radiation (radio waves), at a specific frequency, by an atomic nucleus placed in a strong magnetic field; used in spectroscopy and in magnetic resonance imaging.
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| nuclear magneton |
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noun - (physics) the unit of magnetic moment used to describe nucleons such as the proton
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| nuclear physics |
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noun
- The branch of physics that studies the nucleus of the atom, its internal structure and components.
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| nuclear reaction |
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noun
- a process such as the fission of an atomic nucleus, or the fusion of one or more atomic nuclei and / or subatomic particles in which the number of protons and / or neutrons in a nucleus changes; the reaction products may contain a different element or a different isotope of the same element
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| nuclear reactor |
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noun - (physics) any device in which a controlled chain reaction is maintained for the purpose of creating heat (for power generation) or for creating neutrons and other fission products for experimental, medical or other purposes
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| nucleus |
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noun (pl=nuclei, pl2=nucleuses)
- (context, chemistry, physics) The massive, positively charged central part of an atom made up of protons and neutrons.
- (cytology) A large organelle found in cells which contains genetic material.
- The central part (of something), round which others are collected.
- An initial part that will receive additions.
- This collection will form the of a new library.
- (neuroanatomy) A cluster of many neuronal bodies where synapsing occurs.
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| nuclide |
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noun - (physics) An isotope of an element specified by its atomic number and atomic mass
- Example: Carbon 14 is specified as (nuclide, 14, 6, C) or 6-C-14
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