25-letter words containing s, e, n, a

multi-scene control board — preset board.
nail in the coffin of sth — If you say that one thing is a nail in the coffin of another thing, you mean that it will help bring about its end or failure.
national advanced systems — (company) (NAS) A company, previously known as ITEL, that made IBM plug-compatible hardware and was bought by Hitachi.
national enterprise board — a public corporation established in 1975 to help the economy of the UK. In 1981 it merged with the National Research and Development Council to form the British Technology Group
national insurance number — a number allocated to UK citizens so that they can pay national insurance
national security council — the council, composed of the president, vice president, secretary of state, secretary of defense, director of the Central Intelligence Agency and the chairman of the Joint Chiefs of Staff, that determines means by which domestic, foreign, and military policy can best be integrated for safeguarding the national security. Abbreviation: NSC.
net positive suction head — The net positive suction head is a measure of a pump's performance.
network operations center — (NOC) A location from which the operation of a network or internet is monitored. Additionally, this center usually serves as a clearinghouse for connectivity problems and efforts to resolve those problems. See also Network Information Center.
neurocirculatory asthenia — cardiac neurosis.
never do things by halves — If you say that someone never does things by halves, you mean that they always do things very thoroughly.
nine/seven/ten-day wonder — If you say that someone or something is a nine -day wonder or a one -day wonder, you disapprove of the fact that they are attracting so much interest and attention, because you think that their popularity will only last for a very short time.
non-uniform memory access — (architecture) (NUMA) A memory architecture, used in multiprocessors, where the access time depends on the memory location. A processor can access its own local memory faster than non-local memory (memory which is local to another processor or shared between processors).
not darken someone's door — not come to someone's home
not know what has hit one — to be completely taken by surprise
not take no for an answer — to continue in a course of action despite refusals
observational equivalence — Two terms M and N are observationally equivalent iff for all contexts C[] where C[M] is a valid term, C[N] is also a valid term with the same value.
of someone's acquaintance — A person of your acquaintance is someone who you have met and know.
off the top of one's head — the upper part of the body in humans, joined to the trunk by the neck, containing the brain, eyes, ears, nose, and mouth.
off-balance sheet reserve — a sum of money or an asset that should appear on a company's balance but does not; hidden reserve
on the big/small etc side — If you say that something is on the small side, you are saying politely that you think it is slightly too small. If you say that someone is on the young side, you are saying politely that you think they are slightly too young.
on the edge of one's seat — If you say that someone is on the edge of their seat or chair, you mean that they are very interested in what is happening or what is going to happen.
on the horns of a dilemma — one of the bony, permanent, hollow paired growths, often curved and pointed, that project from the upper part of the head of certain ungulate mammals, as cattle, sheep, goats, or antelopes.
on the side of the angels — If you say that someone is on the side of the angels, you believe very strongly that what they are doing is right.
on the understanding that — with the condition that; providing
open educational resource — Usually, open educational resources. a piece of content or a tool for teaching or learning, often developed online, that is made available free of charge for anyone to use, revise, adapt, or redistribute. Abbreviation: OER.
outside broadcasting unit — a mobile studio from which broadcasts are made
oxidative phosphorylation — the aerobic synthesis, coupled to electron transport, of ATP from phosphate and ADP.
page description language — a high-level programming language for determining the output of a page printer designed to work with it, independent of the printer's internal codes. Abbreviation: PDL.
palo alto research center — XEROX PARC
palo alto research centre — XEROX PARC
pauli exclusion principle — exclusion principle.
pentose phosphate pathway — a sequence of metabolic reactions by which NADPH is synthesized, together with ribose phosphate, part of the synthesis of nucleic acids
peripheral nervous system — the portion of the nervous system lying outside the brain and spinal cord.
personal flotation device — a life preserver, life jacket, or other device for keeping a person afloat in the water. Abbreviation: PFD.
personal injury insurance — Personal injury insurance is coverage for treatment of injuries to car accident victims, including loss of work income, accidental death, and funeral expenses.
personal-opinion telegram — a type of domestic telegram sent at the lowest rate with a minimum charge for 20 words or less to elected federal or state officials on a subject of national or regional interest.
personalized number plate — a car registration plate that has the owner's initials or name on it
phase contrast microscope — a microscope that utilizes the phase differences of light rays transmitted by different portions of an object to create an image in which the details of the object are distinct despite their near-uniformity of refractive index.
phase-contrast microscope — a microscope that utilizes the phase differences of light rays transmitted by different portions of an object to create an image in which the details of the object are distinct despite their near-uniformity of refractive index.
pit one's wits against sb — If you pit your wits against someone, you compete with them in a test of knowledge or intelligence.
play into someone's hands — a dramatic composition or piece; drama.
please clean my room sign — A please clean my room sign is a sign that a guest in a hotel hangs outside their room to tell the cleaner the room is available for cleaning.
polycystic ovary syndrome — a hormonal disorder in which the Graafian follicles in the ovary fail to develop completely so that they are unable to ovulate, remaining as multiple cysts that distend the ovary. The results can include reduced fertility, obesity, and hirsutism
polymerase chain reaction — a technique in which a known DNA sequence is synthesized at high temperatures by means of a polymerase, producing millions of copies for statistical analysis: used in DNA fingerprinting, in detecting minute quantities of cancer cells, etc.
portable network graphics — (file format) /ping/ (PNG) An extensible file format for the lossless, portable, well-compressed storage of raster images. PNG provides a patent-free replacement for GIF and can also replace many common uses of TIFF. Indexed-colour, greyscale and truecolour images are supported, plus an optional alpha channel. Sample depths range from 1 to 16 bits. PNG is designed for on-line viewing applications, such as the World Wide Web, so it is fully streamable with a progressive display option. PNG is robust, providing both full file integrity checking and simple detection of common transmission errors. Also, PNG can store gamma correction and chromaticity data for improved colour matching on heterogeneous platforms.
positional representation — (mathematics) The conventional way of writing numbers as a string of digits in which each digit, D, has value D * R^I, where R is the radix or (number) base and I is the digit's position counting leftward from zero at the least significant (right-hand) end. Each digit can be zero to R-1. Each position has a weight or significance R times greater than the position to its right and the right-most place has a weight of one. Decimal numbers are radix ten, binary numbers are radix two, octal radix eight and hexadecimal radix 16. Positional representation makes arithmetic operations on large numbers much easier than, say, roman numerals. It is fundamental to the binary representation used by digital computers.
preferred ordinary shares — shares issued by a company that rank between preference shares and ordinary shares in the payment of dividends
prices and incomes policy — voluntary or statutory regulation of the level of increases in prices and incomes
principal nursing officer — a grade of nurse concerned with administration in the British National Health Service
principle of least action — the principle that motion between any two points in a conservative dynamical system is such that the action has a minimum value with respect to all paths between the points that correspond to the same energy

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