21-letter words containing i, r, u, s

nonexamination course — a course of study in which there are no examinations
nonrestrictive clause — a relative clause that describes or supplements but is not essential in establishing the identity of the antecedent and is usually set off by commas in English. In This year, which has been dry, is bad for crops the clause which has been dry is a nonrestrictive clause.
north east new guinea — the NE part of the former Australian Territory of New Guinea; now part of Papua New Guinea.
northumberland strait — the part of the Gulf of St. Lawrence that separates Prince Edward Island from New Brunswick and Nova Scotia, in SE Canada. About 200 miles (320 km) long; 9–30 miles (15–48 km) wide.
nuclear cross section — cross section (def 7).
nuclear power station — a station or plant where nuclear energy is converted into heat, electricity, etc
oil-in-water emulsion — An oil-in-water emulsion is a mixture in which an oily medicine is dispersed in water or other liquid.
on o's best behaviour — If someone is on their best behaviour, they are trying very hard to behave well.
optical double (star) — double star (sense 2)
orthophosphorous acid — a white to yellowish, crystalline, hygroscopic, water-soluble solid, H 3 PO 3 , used chiefly in the synthesis of phosphites.
overuse strain injury — (medical) (Or "repetitive strain injury", RSI, "repetitive strain disorder") Any tendon or muscle injury resulting from overuse, usually in the hand, wrist, or arm. Injury may be caused by any combination of repetitive, unacustomed, or prolonged movements, forcefulness, or an awkward position (often due to bad ergonomics). The symptoms are pain, tingling, weakness, numbness, swelling, cracking, stiffness, or reduced coordination. Common conditions are: Carpal tunnel syndrome, where swelling of the membrane linings in your wrist surrounding the tendons that bend your fingers compresses the median nerve. This may result in numbness and pain in the hand, arm, shoulder, and neck. Tennis elbow, where rotating your wrist and using force causes a form of epicondylitis. Tendinitis, where unacustomed exercise or repeated awkward movements inflame wrist, elbow, or shoulder tendons, often leading to severe stiffness. Trigger finger, a popping or catching sensation when you bend your finger, wrist, or shoulder. This form of tenosynovitis is caused by repetitive hand movements. To prevent the condition worsening, treat the pain with heat, cold, or aspirin, ibuprofen, or naproxen sodium; rest; or immobilise the injured area with a splint or bandage. See a doctor.
packed encoding rules — (protocol, standard) (PER) ASN.1 encoding rules for producing a compact transfer syntax for data structures described in ASN.1, defined in 1994. PER provides a much more compact encoding then BER. It tries to represents the data units using the minimum number of bits. The compactness requires that the decoder knows the complete abstract syntax of the data structure to be decoded, however. Documents: ITU-T X.691, ISO 8825-2.
paper-white narcissus — a white-flowered variety of Narcissus tazetta, often forced for indoor bloom.
pathfinder prospectus — a prospectus regarding the flotation of a new company that contains only sufficient details to test the market reaction
percussion instrument — a musical instrument, as the drum, cymbal, triangle, xylophone, or piano, that is struck to produce a sound, as distinguished from string or wind instruments.
peroxydisulfuric acid — persulfuric acid (def 2).
picture quality scale — (graphics) (PQS) A system for rating image quality based upon features of images that affect their perception by the human eye, rather than the traditional signal-to-noise ratio which examines differences for every single pixel.
pincushion distortion — a distortion produced by a lens in which the magnification increases toward the edge of the field.
pipelined burst cache — Pipeline Burst Cache
plate glass insurance — Plate glass insurance is insurance coverage against damage to or breakage of large panes of glass such as shop windows.
play russian roulette — take a foolish risk
ploughman's spikenard — a European plant, Inula conyza, with tubular yellowish flower heads surrounded by purple bracts: family Asteraceae (composites)
pomp and circumstance — ceremony
populist shop steward — a shop steward who operates in a delegate role, putting the immediate interests of his members before union principles and policies
postpartum depression — Postpartum depression is a mental state involving feelings of anxiety and sudden mood swings which some women experience after they have given birth.
potassium bicarbonate — a white, crystalline, slightly alkaline, salty-tasting, water-soluble powder, KHCO 3 , produced by the passage of carbon dioxide through an aqueous potassium carbonate solution: used in cookery as a leavening agent and in medicine as an antacid.
preacquisition profit — the retained profit of a company earned before a takeover and therefore not eligible for distribution as a dividend to the shareholders of the acquiring company
premium savings bonds — (in Britain) bonds issued by the Treasury since 1956 for purchase by the public. No interest is paid but there is a monthly draw for cash prizes of various sums
prince rupert's metal — a brass composed of from about 60 to 85 percent copper and about 15 to 40 percent zinc, used to imitate gold.
pro-industrialization — the large-scale introduction of manufacturing, advanced technical enterprises, and other productive economic activity into an area, society, country, etc.
probable maximum loss — Probable maximum loss is the maximum amount of loss that can be expected under normal circumstances.
progressive education — any of various reformist educational philosophies and methodologies since the late 1800s, applied especially to elementary schools, that reject the rote recitation and strict discipline of traditional, single-classroom teaching, favoring instead more stimulation of the individual pupil as well as group discussion, more informality in the classroom, a broader curriculum, and use of laboratories, gymnasiums, kitchens, etc., in the school.
pseudohermaphroditism — an individual having internal reproductive organs of one sex and external sexual characteristics resembling those of the other sex or being ambiguous in nature. Compare hermaphrodite (def 1).
psychoneuroimmunology — the study of the effects of psychological factors on the immune system
public address system — loudspeaker
public administration — the implementation of public policy, largely by the executive branch.
public health service — the agency that is responsible for the health of the general public
public transportation — means of fare-paying travel
public-address system — a combination of electronic devices that makes sound audible via loudspeakers to many people, as in an auditorium or out of doors.
pulse height analyser — a multichannel analyser that sorts pulses into selected amplitude ranges
pulse height analyzer — an instrument that records or counts an electrical pulse if its amplitude falls within specified limits: used in nuclear physics research for the determination of energy spectra of nuclear radiations
purchasing department — the group of staff within an organization that is responsible for buying goods or products
purple-fringed orchis — either of two North American orchids (Habenaria psycodes and H. fimbriata) with purple-fringed flowers
put in the hard yards — to make a great effort to achieve an end
put sb in the picture — If you put someone in the picture, you tell them about a situation which they need to know about.
put sb in their place — If you put someone in their place, you show them that they are less important or clever than they think they are.
put something over on — to deceive; trick
queer someone's pitch — to upset someone's plans
radius of convergence — a positive number so related to a given power series that the power series converges for every number whose absolute value is less than this particular number.
rayleigh distribution — (mathematics) A curve that yields a good approximation to the actual labour curves on software projects.

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