17-letter words containing p, t, e, r
- a grip on reality — If you say that someone has a grip on reality, you mean they recognize the true situation and do not have mistaken ideas about it.
- a sop to cerberus — a bribe or something given to propitiate a potential source of danger or problems
- a sporting chance — If you have a sporting chance of doing something, it is quite likely that you will do that thing.
- a stiff upper lip — If you say that someone is keeping a stiff upper lip, you mean that they are not showing any emotion even though it is difficult for them not to.
- absorption nebula — a cloud of interstellar gas and dust that absorbs and thus obscures the light from stars behind it, appearing as a dark patch in front of a bright nebula or in an otherwise bright area of sky.
- acanthopterygians — Plural form of acanthopterygian.
- accelerator pedal — a pedal pressed with the foot to make a vehicle go faster
- acceptance region — Statistics. the set of values of a test statistic for which the null hypothesis is accepted.
- accessory pigment — any pigment in plants that can absorb light energy and pass the electrons along to the primary pigment which starts the process of photosynthesis.
- accounting period — a period of time for which accounts are drawn up
- acquaintance rape — a rape that is carried out by someone that the victim knows
- act of parliament — a law that has been passed by both of the UK Houses of Parliament and has received royal assent
- acupressure point — any of the specific points on the body where pressure is applied in acupressure
- adaptive learning — (algorithm) (Or "Hebbian learning") Learning where a system programs itself by adjusting weights or strengths until it produces the desired output.
- adjective pronoun — a pronoun used as an adjective, as his in His dinner is ready.
- adjunct professor — a professor employed by a college or university for a specific purpose or length of time and often part-time.
- aerial photograph — a photograph taken from the air
- agent provocateur — An agent provocateur is a person who is employed by the government or the police to encourage certain groups of people to break the law, so they can arrest them or make them lose public support.
- air-transportable — that can be transported by aircraft: air-transportable equipment.
- all over the shop — If something is happening all over the shop, it is happening in many different places or throughout a wide area.
- alligator snapper — a large, freshwater snapping turtle (Macroclemys temmincki) of the SE U.S. and the Mississippi Valley, found chiefly in rivers and bayous: it may weigh up to 100 kg (220 lb)
- alpha-fetoprotein — a protein that forms in the liver of the human fetus. Excessive quantities in the amniotic fluid and maternal blood may indicate spina bifida in the fetus; low levels may point to Down's syndrome
- altamonte springs — a city in central Florida.
- alternate plumage — (of birds having more than one plumage in their cycle of molts) the plumage of the second molt, usually brighter than the basic plumage.
- alternating group — the subgroup consisting of all even permutations, of the group of all permutations of a finite set.
- amphitheatrically — In a manner such as to appear to have some characteristics of an amphitheatre.
- analogue computer — (computer, hardware) A machine or electronic circuit designed to work on numerical data represented by some physical quantity (e.g. rotation or displacement) or electrical quantity (e.g. voltage or charge) which varies continuously, in contrast to digital signals which are either 0 or 1. For example, the turning of a wheel or changes in voltage can be used as input. Analogue computers are said to operate in real time and are used for research in design where many different shapes and speeds can be tried out quickly. A computer model of a car suspension allows the designer to see the effects of changing size, stiffness and damping.
- anchor escapement — an escapement in which wedge-shaped pallets engage with an escape wheel having pointed teeth, usually facing in the direction of revolution, so that the escape wheel recoils slightly at every release.
- angular leaf spot — a disease of plants, characterized by angular, watery spots on the leaves and fruit, caused by any of several bacteria, as Pseudomonas lachrymans.
- animal experiment — an experiment involving non-human animals
- answering pennant — one of the flags of the International Code of Signals, a pennant of three red and two white vertical stripes, flown at the dip while a message is being interpreted and close up when it is understood.
- anthropogenically — In an anthropogenic way.
- anthropogeography — a branch of anthropology dealing with the geographical distribution of humankind and the relationship between human beings and their environment.
- anthropomorphises — Third-person singular simple present indicative form of anthropomorphise.
- anthropomorphized — Simple past tense and past participle of anthropomorphize.
- anthroposemiotics — The study of human communication.
- anti-profiteering — a person who seeks or exacts exorbitant profits, especially through the sale of scarce or rationed goods.
- antifederal party — the party that, before 1789, opposed the adoption of the proposed Constitution and after that favored its strict construction.
- antihyperglycemic — (of a medication or treatment) Tending to reduce hyperglycemia (high blood sugar, characteristic of diabetes).
- antihypertensives — Plural form of antihypertensive.
- antiproliferation — opposing an increase in nuclear weapons, especially in allowing additional countries to obtain them.
- antiproliferative — of or relating to a substance used to prevent or retard the spread of cells, especially malignant cells, into surrounding tissues.
- apartment complex — An apartment complex is a group of buildings that contain apartments and are managed by the same company.
- aperture priority — an automatic exposure system in which the photographer selects the aperture and the camera then automatically sets the correct shutter speed
- aperture-priority — of or relating to a semiautomatic exposure system in which the photographer presets the aperture and the camera selects the shutter speed.
- api gravity scale — the American Petroleum Institute gravity scale: a universally accepted scale of the relative density of fluids that is used in fuel technology and is measured in degrees API. One degree API is equal to (141.5/d)–131.5, where d = relative density at 288.7K
- apostolic fathers — the Fathers of the early Church who immediately followed the Apostles
- apparent movement — the sensation of seeing movement when nothing actually moves in the environment, as when two neighbouring lights are switched on and off in rapid succession
- application layer — (networking) The top layer of the OSI seven layer model. This layer handles issues like network transparency, resource allocation and problem partitioning. The application layer is concerned with the user's view of the network (e.g. formatting electronic mail messages). The presentation layer provides the application layer with a familiar local representation of data independent of the format used on the network.
- appointed actuary — An appointed actuary is an actuary appointed by a life insurance company, whose main role is to carry out a regular valuation of the reserves held to pay future policy benefits.
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