17-letter words containing a, c, e, t
- natural frequency — the frequency at which a system vibrates when set in free vibration
- natural resources — a naturally occurring source of wealth, as land or water.
- natural selection — the process by which forms of life having traits that better enable them to adapt to specific environmental pressures, as predators, changes in climate, or competition for food or mates, will tend to survive and reproduce in greater numbers than others of their kind, thus ensuring the perpetuation of those favorable traits in succeeding generations.
- natural-resources — a naturally occurring source of wealth, as land or water.
- near-earth object — a comet or asteroid pushed by the gravitational attraction of nearby planets into an orbit that allows it to enter the earth's orbit and thereby pose a danger of collision. Abbreviation: NEO.
- negative catalyst — an inhibitor.
- negative eugenics — the study of or belief in the possibility of improving the qualities of the human species or a human population, especially by such means as discouraging reproduction by persons having genetic defects or presumed to have inheritable undesirable traits (negative eugenics) or encouraging reproduction by persons presumed to have inheritable desirable traits (positive eugenics)
- negative feedback — Electronics. the process of returning part of the output of a circuit, system, or device to the input, either to oppose the input (negative feedback) or to aid the input (positive feedback) acoustic feedback.
- negative particle — a word that indicates negativity, for example 'not' in English or 'ne pas' in French
- neo-scholasticism — a contemporary application of Scholasticism to modern problems and life.
- nephelometrically — By means of nephelometry.
- neuropathological — (medicine) Of, pertaining to, or arising from neuropathology, the pathology of nerve tissue.
- neuropsychiatrist — A medical doctor specializing in neuropsychiatry; a medical doctor dealing with disorders that have both neurological and psychiatric features.
- new scotland yard — See under Scotland Yard (def 1).
- newcastle disease — a rapidly spreading virus-induced disease of birds and domestic fowl, as chickens, marked by respiratory difficulty, reduced egg production and, in chicks, paralysis.
- newspaper cutting — clipping from a news publication
- nikita khrushchev — Nikita S(ergeyevich) [ni-kee-tuh sur-gey-uh-vich;; Russian nyi-kyee-tuh syir-gye-yuh-vyich] /nɪˈki tə sɜrˈgeɪ ə vɪtʃ;; Russian nyɪˈkyi tə syɪrˈgyɛ yə vyɪtʃ/ (Show IPA), 1894–1971, Russian political leader: premier of the U.S.S.R. 1958–64.
- ninth commandment — “Thou shalt not bear false witness against thy neighbor”: ninth of the Ten Commandments.
- nitrogen narcosis — a semistupor, lightheadedness, or euphoria experienced by deep-sea divers when nitrogen from air enters the blood at higher than atmospheric pressure.
- non-certification — the act of certifying.
- non-communicative — inclined to communicate or impart; talkative: He isn't feeling very communicative today.
- non-consideration — the act of considering; careful thought; meditation; deliberation: I will give your project full consideration.
- non-containerized — to package (freight) in uniform, sealed containers for shipment.
- non-controversial — of, relating to, or characteristic of controversy, or prolonged public dispute, debate, or contention; polemical: a controversial book.
- non-discretionary — subject or left to one's own discretion.
- non-materialistic — excessively concerned with physical comforts or the acquisition of wealth and material possessions, rather than with spiritual, intellectual, or cultural values.
- non-reciprocating — to give, feel, etc., in return.
- non-retroactivity — operative with respect to past occurrences, as a statute; retrospective: a retroactive law.
- non-stereotypical — a process, now often replaced by more advanced methods, for making metal printing plates by taking a mold of composed type or the like in papier-mâché or other material and then taking from this mold a cast in type metal.
- non-thermoplastic — soft and pliable when heated, as some plastics, without any change of the inherent properties.
- nonaccomplishment — Something that does not achieve the intended goal.
- nonimpact printer — a printer that creates images without mechanically impacting the page, as an ink-jet or laser printer.
- nonteaching staff — employees within an academic or vocational environment whose jobs do not involve teaching
- north miami beach — a city in SE Florida.
- northern michigan — the peninsula between lakes Superior and Michigan constituting the N part of Michigan. Abbreviation: U.P.
- norwegian current — an ocean current formed from the terminus of the North Atlantic Current, flowing N along the Norwegian coast into the Barents Sea.
- not mince matters — to speak frankly
- nuclear chemistry — the branch of chemistry concerned with nuclear reactions
- nuclear deterrent — a country's nuclear weapons viewed as a deterrent to other countries from attacking
- nuclear radiation — Physics. radiation in the form of elementary particles emitted by an atomic nucleus, as alpha rays or gamma rays, produced by decay of radioactive substances or by nuclear fission.
- nuclear scientist — a scientist who studies nuclear physics
- nuclear threshold — the point in war at which a combatant brings nuclear weapons into use
- numerical control — control of a machine tool, or other device used in a manufacturing process, by a computer, other control circuitry, or recorded digital commands.
- nursery education — education provided at a school for young children, usually from three to five years old
- objectionableness — The quality of being objectionable.
- occipital condyle — a protrusion on the occipital bone of the skull that forms a joint with the first cervical vertebra, enabling the head to move relative to the neck.
- octadecanoic acid — stearic acid.
- off-site facility — An off-site facility is a facility which is not at the main industrial or commercial site.
- off-year election — (in the US) an election held in a year when a presidential election does not take place
- office automation — a method or system of using automated or electronic equipment, as word processors and computers, in the operations of an office.