17-letter words containing d, e, a, n

musical interlude — an interval in a play, event or occasion during which music is played
mustard and cress — Mustard and cress is very young mustard plants and cress plants grown together and eaten in salad.
mutual inductance — the ratio of the electromotive force in one of two circuits to the rate of change of current in the other circuit.
naked singularity — an infinitely dense point mass without a surrounding black hole
narrow-shouldered — having shoulders which do not extend very far from the neck; not broad-shouldered
national identity — characteristics of a given nationality
natural deduction — (logic) A set of rules expressing how valid proofs may be constructed in predicate logic. In the traditional notation, a horizontal line separates premises (above) from conclusions (below). Vertical ellipsis (dots) stand for a series of applications of the rules. "T" is the constant "true" and "F" is the constant "false" (sometimes written with a LaTeX \perp). "^" is the AND (conjunction) operator, "v" is the inclusive OR (disjunction) operator and "/" is NOT (negation or complement, normally written with a LaTeX \neg). P, Q, P1, P2, etc. stand for propositions such as "Socrates was a man". P[x] is a proposition possibly containing instances of the variable x, e.g. "x can fly". A proof (a sequence of applications of the rules) may be enclosed in a box. A boxed proof produces conclusions that are only valid given the assumptions made inside the box, however, the proof demonstrates certain relationships which are valid outside the box. For example, the box below labelled "Implication introduction" starts by assuming P, which need not be a true proposition so long as it can be used to derive Q. Truth introduction: - T (Truth is free). Binary AND introduction: ----------- | . | . | | . | . | | Q1 | Q2 | ----------- Q1 ^ Q2 (If we can derive both Q1 and Q2 then Q1^Q2 is true). N-ary AND introduction: ---------------- | . | .. | . | | . | .. | . | | Q1 | .. | Qn | ---------------- Q1^..^Qi^..^Qn Other n-ary rules follow the binary versions similarly. Quantified AND introduction: --------- | x . | | . | | Q[x] | --------- For all x . Q[x] (If we can prove Q for arbitrary x then Q is true for all x). Falsity elimination: F - Q (Falsity opens the floodgates). OR elimination: P1 v P2 ----------- | P1 | P2 | | . | . | | . | . | | Q | Q | ----------- Q (Given P1 v P2, if Q follows from both then Q is true). Exists elimination: Exists x . P[x] ----------- | x P[x] | | . | | . | | Q | ----------- Q (If Q follows from P[x] for arbitrary x and such an x exists then Q is true). OR introduction 1: P1 ------- P1 v P2 (If P1 is true then P1 OR anything is true). OR introduction 2: P2 ------- P1 v P2 (If P2 is true then anything OR P2 is true). Similar symmetries apply to ^ rules. Exists introduction: P[a] ------------- Exists x.P[x] (If P is true for "a" then it is true for all x). AND elimination 1: P1 ^ P2 ------- P1 (If P1 and P2 are true then P1 is true). For all elimination: For all x . P[x] ---------------- P[a] (If P is true for all x then it is true for "a"). For all implication introduction: ----------- | x P[x] | | . | | . | | Q[x] | ----------- For all x . P[x] -> Q[x] (If Q follows from P for arbitrary x then Q follows from P for all x). Implication introduction: ----- | P | | . | | . | | Q | ----- P -> Q (If Q follows from P then P implies Q). NOT introduction: ----- | P | | . | | . | | F | ----- / P (If falsity follows from P then P is false). NOT-NOT: //P --- P (If it is not the case that P is not true then P is true). For all implies exists: P[a] For all x . P[x] -> Q[x] ------------------------------- Q[a] (If P is true for given "a" and P implies Q for all x then Q is true for a). Implication elimination, modus ponens: P P -> Q ---------- Q (If P and P implies Q then Q). NOT elimination, contradiction: P /P ------ F (If P is true and P is not true then false is true).
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.
nervous breakdown — (not in technical use) any disabling mental disorder requiring treatment.
neurodegenerative — Resulting in or characterized by degeneration of the nervous system, especially the neurons in the brain.
never looked back — If you say that someone did something and then never looked back, you mean that they were very successful from that time on.
new england aster — a tall composite plant, Aster novae-angliae, of the northeastern U.S., the flowers of which have lavender to deep-purple rays.
new england range — a plateau in New South Wales in SE Australia, in the Great Dividing Range, rising to 5000 feet (1524 meters).
new guinea pidgin — the variety of Neo-Melanesian spoken in Papua New Guinea and neighbouring islands
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.
newfoundland time — a form of civil time observed on the island of Newfoundland, one and one-half hours later than Eastern time and a half hour later than Atlantic time.
nial systems ltd. — Distributors of Q'NIAL. Address: Ottawa Canada. Telephone: Canada (613) 234 4188.
niger-kordofanian — a language family comprising Niger-Congo and Kordofanian.
nightshade family — the plant family Solanaceae, characterized by herbaceous plants, trees, shrubs, and vines having alternate, simple or pinnate leaves, conspicuous flowers, and fruit in the form of a berry or capsule, and including belladonna, eggplant, nightshade, peppers of the genus Capsicum, petunia, potato, tobacco, and tomato.
nine days' wonder — an event or thing that arouses considerable but short-lived interest or excitement.
ninety-day wonder — an officer commissioned in a branch of the armed forces after an unusually short training period, especially after a three-months officers' training course during World War II.
ninth commandment — “Thou shalt not bear false witness against thy neighbor”: ninth of the Ten Commandments.
non-biodegradable — capable of decaying through the action of living organisms: biodegradable paper; biodegradable detergent.
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-demonstrative — characterized by or given to open exhibition or expression of one's emotions, attitudes, etc., especially of love or affection: She wished her fiancé were more demonstrative.
non-discretionary — subject or left to one's own discretion.
nondenominational — of or relating to a denomination or denominations.
nonunderstandable — Not understandable.
nord-ostsee kanal — German name of Kiel Canal.
northern rhodesia — former name of Zambia.
northern sporades — a group of Greek islands in the Aegean, lying northeast of Euboea
not bat an eyelid — When something surprising or shocking happens, if someone doesn't bat an eyelid in British English, or doesn't bat an eye in American English, they remain calm and do not show any reaction.
not one's idea of — not what one regards as (hard work, a holiday, etc)
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 threshold — the point in war at which a combatant brings nuclear weapons into use
nursery education — education provided at a school for young children, usually from three to five years old
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.
odds-on favourite — a person, team, horse, etc that is regarded as the most likely to win a competition
old age pensioner — An old age pensioner is a person who is old enough to receive an pension from their employer or the government.
old norman french — Norman French (sense 1)
old red sandstone — a thick sequence of sedimentary rock (generally, but not always, red) deposited in Britain and NW Europe during the Devonian period
on a razor's edge — in an acute dilemma
on one's deathbed — about to die
on the barrelhead — upon being presented for sale; at the time of delivery
on the foundation — an endowment or legacy for the perpetual support of an institution such as a school or hospital
on the heavy side — tending to be too heavy

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