20-letter words containing t, r, n

mopping-up operation — an operation after a battle or campaign to root out remaining enemy forces or installations
moreton bay chestnut — an Australian leguminous tree, Castanospermum australe, having thin smooth bark and yellow or reddish flowers: used in furniture manufacture
most general unifier — (logic) If U is the most general unifier of a set of expressions then any other unifier, V, can be expressed as V = UW, where W is another substitution. See also unification.
motor neuron disease — Motor neuron disease is a disease which destroys the part of a person's nervous system that controls movement.
mountain rescue team — a group of people who conduct search and rescue on a mountain, for example of someone who has fallen, got lost, etc
multi-user dimension — (games) (MUD) (Or Multi-User Domain, originally "Multi-User Dungeon") A class of multi-player interactive game, accessible via the Internet or a modem. A MUD is like a real-time chat forum with structure; it has multiple "locations" like an adventure game and may include combat, traps, puzzles, magic and a simple economic system. A MUD where characters can build more structure onto the database that represents the existing world is sometimes known as a "MUSH". Most MUDs allow you to log in as a guest to look around before you create your own character. Historically, MUDs (and their more recent progeny with names of MU- form) derive from a hack by Richard Bartle and Roy Trubshaw on the University of Essex's DEC-10 in 1979. It was a game similar to the classic Colossal Cave adventure, except that it allowed multiple people to play at the same time and interact with each other. Descendants of that game still exist today and are sometimes generically called BartleMUDs. There is a widespread myth that the name MUD was trademarked to the commercial MUD run by Bartle on British Telecom (the motto: "You haven't *lived* 'til you've *died* on MUD!"); however, this is false - Richard Bartle explicitly placed "MUD" in the PD in 1985. BT was upset at this, as they had already printed trademark claims on some maps and posters, which were released and created the myth. Students on the European academic networks quickly improved on the MUD concept, spawning several new MUDs (VAXMUD, AberMUD, LPMUD). Many of these had associated bulletin-board systems for social interaction. Because these had an image as "research" they often survived administrative hostility to BBSs in general. This, together with the fact that Usenet feeds have been spotty and difficult to get in the UK, made the MUDs major foci of hackish social interaction there. AberMUD and other variants crossed the Atlantic around 1988 and quickly gained popularity in the US; they became nuclei for large hacker communities with only loose ties to traditional hackerdom (some observers see parallels with the growth of Usenet in the early 1980s). The second wave of MUDs (TinyMUD and variants) tended to emphasise social interaction, puzzles, and cooperative world-building as opposed to combat and competition. In 1991, over 50% of MUD sites are of a third major variety, LPMUD, which synthesises the combat/puzzle aspects of AberMUD and older systems with the extensibility of TinyMud. The trend toward greater programmability and flexibility will doubtless continue. The state of the art in MUD design is still moving very rapidly, with new simulation designs appearing (seemingly) every month. There is now a move afoot to deprecate the term MUD itself, as newer designs exhibit an exploding variety of names corresponding to the different simulation styles being explored. See also bonk/oif, FOD, link-dead, mudhead, MOO, MUCK, MUG, MUSE, chat.
multicast addressing — Ethernet addressing scheme used to send packets to devices of a certain type or for broadcasting to all nodes. The least significant bit of the most significant byte of a multi-cast address is one.
multipart stationery — continuous stationery comprising two or more sheets, either carbonless or with carbon paper between the sheets
multiple inheritance — (programming) In object-oriented programming, the possibility that a class may have more than one direct superclass in the class hierarchy. The opposite is single inheritance.
multiple personality — a rare disorder in which an individual displays several functionally dissociated personalities, each of a complexity comparable to that of a normal individual.
multistep hydroplane — a motorship having a flat bottom built as a series of planes inclined forward, the ship planing on each from stem to stern as its speed increases.
mum-and-dad investor — a small-scale non-professional investor
naturalistic fallacy — the supposed fallacy of inferring evaluative conclusions from purely factual premises
neapolitan ice cream — variously flavored and colored ice cream and ice mixtures frozen in layers.
near someone's heart — dear or important to someone
near-market research — scientific research that, while not linked to the development of a specific product, is likely to be commercially exploitable
negative electricity — the electricity present in a body or substance that has an excess of electrons, as the electricity developed on a resin when rubbed with flannel.
nemine contradicente — no one contradicting; unanimously.
neon lamp (or tube) — a discharge lamp containing neon, that ionizes and glows with a red light (neon light) when an electric current is sent through it: used esp. in advertising signs
net domestic product — the gross domestic product minus an allowance for the depreciation of capital goods
net national product — the gross national product less allowance for depreciation of capital goods. Abbreviation: NNP.
net realizable value — the net value of an asset if it were to be sold, taking into account the cost of making the sale and of bringing the asset into a saleable state
net register tonnage — the taxable gross tonnage of a merchant ship.
netherlands antilles — a Netherlands overseas territory in the Caribbean Sea, N and NE of Venezuela; includes the islands of Aruba, Bonaire, Curaçao, Saba, and St. Eustatius, and the S part of St. Martin: considered an integral part of the Dutch realm. 366 sq. mi. (948 sq. km). Capital: Willemstad.
network transparency — (networking) A feature of an operating system or other service which lets the user access a remote resource through a network without having to know if the resource is remote or local. For example NFS allow users to access remote files as if they were local files.
neuromusculoskeletal — (medicine) Describing the interactions between nerves, muscles and the skeleton.
neuropsychiatrically — In terms of neuropsychiatry.
neutral interconnect — Network infrastructure where network service providers can freely exchange traffic without policy restrictions. Examples are the GIX (Global Internet Exchange) at MAE-East (A Metropolitan Area Ethernet around Washington), and the Ebone (European Backbone). There is currently (November 1993) no UK Neutral Interconnect.
new democratic party — the Canadian social democratic party formed in 1961
newcastle-under-lyme — a town in W central England, in Staffordshire. Pop: 74 427 (2001)
next program counter — (architecture) (nPC) A register in a CPU that contains the address of the instruction to be executed next.
nickel tetracarbonyl — nickel carbonyl.
nictitating membrane — a thin membrane, or inner or third eyelid, present in many animals, capable of being drawn across the eyeball, as for protection.
night storage heater — a heater or radiator that stores heat at night-time because electricity is cheaper
nikkei stock average — an index of prices on the Tokyo Stock Exchange
non-volatile storage — (storage) (NVS, persistent storage, memory) A term describing a storage device whose contents are preserved when its power is off. Storage using magnetic media (e.g. magnetic disks, magnetic tape or bubble memory) is normally non-volatile by nature whereas semiconductor memories (static RAM and especially dynamic RAM) are normally volatile but can be made into non-volatile storage by having a (rechargable) battery permanently connected. Other examples of non-volatile storage are EEPROM, CD-ROM, paper tape and punched cards.
nonaccidental injury — damage, such as a bruise, burn, or fracture, deliberately inflicted on a child or an old person
noncatalytic reactor — A noncatalytic reactor is a reactor in which no catalyst is used.
nondirective therapy — client-centered therapy.
nonintrusive testing — (testing) Testing that is transparent to the software under test, i.e., does not change its timing or processing characteristics. Nonintrusive testing usually involves additional hardware that collects timing or processing information and processes that information on another platform.
nonrepeating decimal — a decimal representation of any irrational number, having the property that no sequence of digits is repeated ad infinitum.
nonsense correlation — a correlation supported by data but having no basis in reality, as between incidence of the common cold and ownership of televisions
normal magnification — the magnification produced by a telescope or microscope such that the diameter of the exit pupil of the instrument is equal to the diameter of the pupil of the eye.
normal zeeman effect — the dividing of a spectral line or lines as a result of placing a radiation source in a magnetic field. The division consists of three equally spaced lines (normal Zeeman effect) in systems for which the spin quantum number is zero, or of three or more unequally spaced lines (anomalous Zeeman effect) in systems for which the spin quantum number is not zero.
north american plate — a major tectonic division of the earth's crust, comprising Greenland and the continent of North America and the suboceanic Labrador and North American Basins, and bounded on the east by the Mid-Atlantic Ridge, on the south by the Caribbean and South American Plates, and on the west by the San Andreas fault and Aleutian Trench.
north atlantic drift — an ocean current flowing NE toward the British Isles, formed by the convergence of the Gulf Stream and the Labrador Current SE of Newfoundland.
north canadian river — a river in NE New Mexico, E Texas, and E Oklahoma, flowing SE to the Canadian River. 760 miles (1223 km) long.
north celestial pole — the point of intersection of the earth's extended axis and the northern half of the celestial sphere, lying about 1° from Polaris
north richland hills — a town in N Texas.
north temperate zone — the part of the earth's surface between the tropic of Cancer and the Arctic Circle.

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