25-letter words containing i, s, t

not know what has hit one — to be completely taken by surprise
nothing to choose between — (of two people or objects) almost equal
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.
occupational psychologist — a person who makes a study of human behaviour at work, including ergonomics, selection procedures, and the effects of stress
of someone's acquaintance — A person of your acquaintance is someone who you have met and know.
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 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.
open systems interconnect — Open Systems Interconnection
organizational psychology — the study of the structure of an organization and of the ways in which the people in it interact, usually undertaken in order to improve the organization
orpheus in the underworld — a classical operetta; the French name is Orphée aux enfers
out of sight, out of mind — If you say 'out of sight, out of mind', you mean that people quickly forget someone if he or she goes away.
outside broadcasting unit — a mobile studio from which broadcasts are made
own or similar occupation — A policyholder's own or similar occupation is the job that they were doing before they became disabled or a job with similar duties and training.
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.
party political broadcast — A party political broadcast is a short broadcast on radio or television made by a political party, especially before an election. It explains their views and often criticizes other political parties.
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-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
petropavlovsk-kamchatskiy — seaport in E Asian Russia, on Kamchatka Peninsula: pop. 210,000
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.
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.
potassium sodium tartrate — a colorless or white, water-soluble solid, KNaC 4 H 4 O 6 ⋅4H 2 O, used in silvering mirrors, in the manufacture of Seidlitz powders and baking powder, and in medicine as a laxative.
poynting-robertson effect — the slowing down and consequent spiraling inward of small particles orbiting the sun, due to their interaction with solar radiation.
pressurized-water reactor — a nuclear reactor using water as coolant and moderator at a pressure that is too high to allow boiling to take place inside the reactor. The fuel is enriched uranium oxide cased in zirconium
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
profit and loss statement — A profit and loss statement is a statement that is compiled at the end of a financial year showing that year's revenue and expense items and indicating gross and net profit or loss.
progressive federal party — a political party, formed in 1977 by a merger between the Progressive Party and members of the United Party, supporting qualified franchise for all South Africans irrespective of race, colour, or creed; merged with other parties in 1989 to form the Democratic Party
property damage insurance — insurance against losses arising from damage to the property of others, as in a motor-vehicle accident.
psychiatric social worker — (in Britain) a qualified person who works with mentally-ill people and their families, based in a psychiatric hospital, child guidance clinic, or social services department area team, and who may also be an approved social worker
public key infrastructure — (cryptography, communications) (PKI) A system of public key encryption using digital certificates from Certificate Authorities and other registration authorities that verify and authenticate the validity of each party involved in an electronic transaction. PKIs are currently evolving and there is no single PKI nor even a single agreed-upon standard for setting up a PKI. However, nearly everyone agrees that reliable PKIs are necessary before electronic commerce can become widespread.
public relations exercise — something which is done for the sake of attracting favourable publicity
pull/get one's finger out — If you tell someone to pull their finger out or to get their finger out, you are telling them rudely that you want them to start doing some work or making an effort.
put on one's thinking cap — to ponder a matter or problem
put one's head in a noose — to bring about one's own downfall
put sth out of its misery — If you put an animal out of its misery, you kill it because it is sick or injured and cannot be cured or healed.
put/set sb's mind at rest — To put someone's mind at rest or set their mind at rest means to tell them something that stops them worrying.
raise (or lower) the bar — raise (or lower) the standard of judgment
rate monotonic scheduling — (algorithm) A means of scheduling the time allocated to periodic hard-deadline real-time users of a resource. The users are assigned priorities such that a shorter fixed period between deadlines is associated with a higher priority. Rate monotonic scheduling provides a low-overhead, reasonably resource-efficient means of guaranteeing that all users will meet their deadlines provided that certain analytical equations are satisfied during the system design. It avoids the design complexity of time-line scheduling and the overhead of dynamic approaches such as earliest-deadline scheduling.
read someone the riot act — If someone in authority reads you the riot act, they tell you that you will be punished unless you start behaving properly.

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