18-letter words containing a, r, m, p
- optical microscope — traditional magnifying instrument
- outer automorphism — an automorphism that is not an inner automorphism.
- outreach programme — a programme designed to help and encourage disadvantaged members of the community
- pairs championship — an event in a sport such as tennis or darts open to pairs of competitors
- palm beach gardens — a city in SE Florida, near North Palm Beach.
- palmer archipelago — a group of islands in the South Atlantic Ocean, off the NW coast of the Antarctic Peninsula.
- pan american union — a former organization of American republics dedicated to furthering understanding and peace: replaced in 1970 by the secretariat of the Organization of American States.
- parachute regiment — an airborne regiment of an army
- parallactic motion — the apparent motion of stars due to the earth's orbital motion.
- parallel computing — parallel processing
- parallel importing — the importing of certain goods, esp pharmaceutical drugs, by dealers who undersell local manufacturers
- parallelogram rule — a rule for finding the resultant of two vectors by constructing a parallelogram with two adjacent sides representing the magnitudes and directions of the vectors, the diagonal through the point of intersection of the vectors representing their resultant
- parliamentarianism — advocacy of a parliamentary system of government.
- particeps criminis — an accomplice in a crime.
- particulate matter — Particulate matter is solid or liquid particles in the air, which are measured in PM-10 units and are particles with a diameter of ten micrometers or less.
- pathname separator — (file system) The character used to separate elements of a path or pathname. Under Unix and POSIX.1 compliant systems the pathname separator is the (forward) slash, in MS-DOS backslash serves the same purpose. For obvious reasons the no directory or file name can contain this character.
- payment by results — a system of wage payment whereby all or part of the wage varies systematically according to the level of work performance of an employee
- pci mezzanine card — (hardware) (PMC) A family of low profile mezzanine cards for VMEbus, Futurebus+, desktop computers and other computer systems with logical and electrical layers based on the Peripheral Component Interconnect (PCI) specification. PMC is defined in IEEE P1386.1 and follows the Common Mezzanine Card (CMC) mechanical specification. PCI2.0 defines a 4.2 inch by 12.3 inch board that plugs perpendicularly into a mother board.
- pemphigus vulgaris — a potentially fatal blistering skin disease, characterized by large blisters on the skin, mucous membranes of the mouth, genitals, intestines, etc, which eventually rupture and form painful denuded areas from which critical amounts of bodily protein, fluid, and blood may be lost
- people's democracy — (in Communist ideology) a country or form of government in transition from bourgeois democracy to socialism. In this stage there is more than one class, the largest being the proletariat, led by the Communist Party, which is therefore the dominant power
- peppermint camphor — menthol.
- perceptual mapping — the use of a graph or map in the development of a new product, in which the proximity of consumers' images of the new product to those of an ideal product provide an indication of the new product's likely success
- performance artist — an artist that is involved in a theatrical presentation that incorporates various art forms, such as dance, sculpture, music, etc
- permanent hardness — hardness of water that cannot be removed by boiling as it results mainly from the presence of calcium and magnesium chlorides and sulphates
- permanent resident — an immigrant who has been given official residential status, often prior to being granted citizenship
- pernicious anaemia — Pernicious anaemia is a very severe blood disease.
- personal exemption — Your personal exemption is the amount of money that is deducted from your gross income before you have to start paying income tax.
- phantasmagorically — having a fantastic or deceptive appearance, as something in a dream or created by the imagination.
- phantom withdrawal — the unauthorized removal of funds from a bank account using an automated teller machine
- philharmonic pitch — a standard of pitch in which A above middle C is established at 440 vibrations per second.
- photoisomerization — isomerization induced by light.
- physical chemistry — the branch of chemistry dealing with the relations between the physical properties of substances and their chemical composition and transformations.
- plane trigonometry — the branch of trigonometry dealing with plane triangles.
- plumber's merchant — a shop or business that sells things needed for the job of installing and repairing pipes, fixtures, etc, for water, drainage, and gas
- pneumatic conveyor — a tube through which powdered or granular material, such as cement, grain, etc is transported by a flow of air
- polychromatophilic — having an affinity for more than one kind of stain, especially for acid, neutral, and basic stains, as polychromatophilic erythroblasts characteristic of pernicious anemia.
- population pyramid — a graph showing the distribution of a population by sex, age, etc.
- portable equipment — Portable equipment is electrical equipment that can easily be moved from one place to another while in operation or while connected to the supply.
- postmaster general — the executive head of the postal system of a country.
- postmillenarianism — postmillennialism.
- postviral syndrome — debilitating condition occurring as a sequel to viral illness
- potassium chlorate — a white or colorless, crystalline, water-soluble, poisonous solid, KClO 3 , used chiefly as an oxidizing agent in the manufacture of explosives, fireworks, matches, bleaches, and disinfectants.
- potassium chloride — a white or colorless, crystalline, water-soluble solid, KCl, used chiefly in the manufacture of fertilizers and mineral water, and as a source of other potassium compounds.
- potassium fluoride — a white, crystalline, hygroscopic, toxic powder, KF, used chiefly as an insecticide, a disinfectant, and in etching glass.
- potassium myronate — sinigrin.
- pragmatic sanction — any one of various imperial decrees with the effect of fundamental law.
- prayer of manasses — a book of the Apocrypha.
- preantepenultimate — third from the end.
- presenile dementia — a form of dementia, of unknown cause, starting before a person is old
- pressure altimeter — an aneroid barometer adapted for measuring altitude by converting the indicated atmospheric pressure to altitude according to a standard relationship.