| 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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| NA |
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initialism
- Narcotics Anonymous
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| naphtha |
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noun
- (dated) Naturally-occuring liquid petroleum.
- Any of a wide variety of aliphatic or aromatic liquid hydrocarbon mixtures distilled from petroleum or coal tar, especially as used in solvents or petrol.
- 1995, Philip Pullman, Northern Lights:
- : The Common Room and the Library were lit by anbaric light, but the Scholars preferred the older, softer lamps in the Retiring Room.
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| naphthalene |
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noun
- A white crystalline hydrocarbon manufactured from coal tar; used in mothballs.
- (organic compound) An aromatic bicyclic hydrocarbon, C10H8; an acene containing two fused benzene rings.
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| naphthene |
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noun - (chemistry) any cycloalkane (or alkyl derivative)
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| nascent |
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adjective
- emerging; just coming into existence
- India has a space industry.
- (chemistry) of the state of an element at the time it is generated from some compound
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| NB |
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initialism or N.B.
- Nota bene; used in written English to introduce something to be noted.
- NB: Do not write below this line.
- New Brunswick (Canadian province)
- North Bound
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| ND |
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abbreviation
- North Dakota, a state of the United States of America.
- negligent, Negligent discharge, Discharge. Military, accidental firing of a weapon
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| NE |
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abbreviation
- Nebraska, a state of the United States of America.
- northeast, Northeast, a cardinal point of the compass.
- not, Not evaluated.
- norepinephrine, Norepinephrine.
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| negative |
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noun
- (photography) an image in which dark areas represent light ones, and the converse
- (grammar) a word that indicates negation
- (mathematics) a negative quantity
- (weightlifting): A rep performed with weight in which the muscle begins at maximum contraction and is slowly extended; a movement performed using only the eccentric phase of muscle movement.
adjective
- not positive or neutral
- inherently damaging; undesirable
- electrical charge of an electron and related particles
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| neodymium |
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noun
- a metallic chemical element (symbol Nd) with an atomic number of 60.
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| neon |
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noun
- The chemical element (symbol Ne) with an atomic number of 10.
- neon signs, collectively.
- a neon tetra fish
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| neon lamp |
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noun
- a small gas discharge lamp containing neon gas, sometimes with other noble gases to add colour
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| neoprene |
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noun - a synthetic rubber, a polymer of chloroprene, commonly used in wetsuits etc
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| nephelometer |
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noun
- (analytical chemistry) An instrument for measuring various aspects of the suspended particles in a fluid; especially in a colloid.
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| neutral |
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noun
- A nonaligned state, or a member of such a state
- A person who takes no side in a dispute
- A neutral hue
- The position of a set of gears in which power cannot be transmitted to the drive mechanism
- An electrical terminal that is not electrified
adjective
- Not taking sides in a conflict such as war; nonaligned.
- Favouring neither the supporting nor opposing viewpoint of a topic of debate; unbiased.
- (grammar) Neither positive nor negative.
- Neither beneficial nor harmful.
- Having no sex; neuter.
- Having no obvious colour; gray
- (physics) Neither positive nor negative; possessing no charge or equivalent positive and negative charge such that there is no imbalance.
- (chemistry) Having a pH of 7, neither acidic nor alkaline.
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| neutralize |
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verb (neutraliz, ing)
- To make inactive or ineffective.
- The antidote neutralized the toxin.
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| nickel |
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noun
- (uncountable) A silvery elemental metal with an atomic number of 28 and symbol Ni.
- (US, Canada, countable) A coin worth 5 cents.
- (US slang; sometimes the nickel or the hot nickel) Interstate 5, a highway that runs along the west coast of the United States.
- (slang) A playing card with the rank of five
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| nickelic |
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adjective - Containing nickel.
- (chemistry) Containing trivalent nickel.
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| nickelous |
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adjective - Containing nickel.
- (chemistry) Containing bivalent nickel.
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| nicotine |
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noun
- (chemistry) An alkaloid (C10H14N2), commonly occurring in the tobacco plant. In small doses it is a habit-forming stimulant, in larger doses it is toxic and is often used in insecticides. It is possibly a carcinogen.
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| niter |
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noun (US spelling)
- (chemistry) A mineral form of potassium nitrate used in making gunpowder.
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| nitric oxide |
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noun - (chemistry) the binary compound of nitrogen and oxygen NO; an unstable compound which rapidly oxidizes in the presence of air
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| nitrogen dioxide |
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noun - (chemistry) the binary compound NO2, a brownish gas that is a poisonous air pollutant; it exists in equilibrium with dinitrogen tetroxide
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| nitrogen tetroxide |
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noun - (chemistry) dinitrogen tetroxide
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| nitrostarch |
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noun
- an explosive powder prepared by the nitration of starch; used for demolition
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| noble |
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noun
- An aristocrat; one of aristocratic blood
adjective
- Having honorable qualities; having moral eminence and freedom from anything petty, mean or dubious in conduct and character
- He made a effort.
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| noble gas |
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noun
- (chemistry) Any of the elements of group 0 of the periodic table, being monatomic and (with very limited exceptions) inert.
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| nonmetal |
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noun - (chemistry) an element, such as phosphorus or chlorine, that does not have the chemical or physical properties of a metal
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| nonmetallic |
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adjective - (chemistry) of, relating to, or having the properties of a nonmetal
- not metallic
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| nonpolar |
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adjective - (physics) not containing a dipole
- (chemistry) not ionic; not dissociating into ions when dissolved in water etc
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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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| nucleophilic |
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adjective nucleoophilic
- (chemistry) of, or relating to an nucleophile
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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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