21-letter words containing r, u, d, a, s

peroxydisulfuric acid — persulfuric acid (def 2).
pipelined burst cache — Pipeline Burst Cache
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.
premenstrual syndrome — a complex of physical and emotional changes, including depression, irritability, appetite changes, bloating and water retention, breast soreness, and changes in muscular coordination, one or more of which may be experienced in the several days before the onset of menstrual flow. Abbreviation: PMS.
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
pro-industrialization — the large-scale introduction of manufacturing, advanced technical enterprises, and other productive economic activity into an area, society, country, etc.
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).
public address system — loudspeaker
public administration — the implementation of public policy, largely by the executive branch.
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.
purchasing department — the group of staff within an organization that is responsible for buying goods or products
put in the hard yards — to make a great effort to achieve an end
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.
reduced circumstances — If you say that someone is living in reduced circumstances, you mean that they do not have as much money as they used to have.
registration document — a document giving identification details of a motor vehicle, including its manufacturer, date of registration, engine and chassis numbers, and owner's name
residual unemployment — the unemployment that remains in periods of full employment, as a result of those mentally, physically, or emotionally unfit to work
ring-around-the-rosey — a children's game in which the players sing while going around in a circle and squat when the lyrics “all fall down” are sung.
roodepoort-maraisburg — a city in S Transvaal, in the NE Republic of South Africa.
rutherford scattering — the scattering of an alpha particle through a large angle with respect to the original direction of motion of the particle, caused by an atom (Rutherford atom) with most of the mass and all of the positive electric charge concentrated at a center or nucleus.
s-k reduction machine — An abstract machine defined by Professor David Turner to evaluate combinator expressions represented as binary graphs. Named after the two basic combinators, S and K.
saint-maur-des-fosses — a town in N central France, near Paris, on the Marne River.
sampling distribution — the distribution of a statistic based on all possible random samples that can be drawn from a given population.
scalar triple product — the volume of the parallelepiped defined by three given vectors, u, v, and w, usually represented as u·v 1 (v×w), [ uvw ], or (uvw), where × denotes a cross product and · denotes an inner product.
sedimentary sequences — Sedimentary sequences are layers of rock which are derived from weathered rocks, biogenic (= of living organisms) activity, or precipitation from solution.
silicon tetrafluoride — a colorless, fuming gas, SiF 4 , used chiefly in the manufacture of fluosilicic acid.
sing a different tune — a succession of musical sounds forming an air or melody, with or without the harmony accompanying it.
sinusoidal projection — an equal-area projection in which parallels are straight lines spaced at regular intervals, the central meridian is a straight line one-half the length of the equator, and the other meridians are curves symmetrical to the central meridian.
snr bandwidth product — (communications) The integral of the SNR over frequency. The SNR bandwidth product is an important limit in the capacity of a communication channel.
sovereign wealth fund — an investment fund created using the financial assets of a national government
statutory declaration — a declaration made under statutory authority before a justice of the peace or commissioner for oaths which may in certain cases be substituted for a statement on oath
steady state universe — a universe described by the steady state theory.
student participation — the extent to which students participate or involve themselves in a class, course, etc
submerged arc welding — a type of heavy electric-arc welding using mechanically fed bare wire with the arc submerged in powdered flux to keep out oxygen
suction and curettage — a technique involving extraction of the fetus through a suction tube, used to perform abortions during the early stages of pregnancy.
sunday school teacher — someone who teaches at a Sunday school
surface friction drag — the part of the drag on a body moving through a fluid that is dependent on the nature of the surface of the body
surface-to-underwater — (of a missile, message, etc.) traveling from the surface of the earth to a target underwater.
take under advisement — to consider carefully
the household cavalry — a group of British soldiers on horseback who have the job of protecting the king or queen and their family
the san andreas fault — a geological fault in California
theater of the absurd — theater in which standard or naturalistic conventions of plot, characterization, and thematic structure are ignored or distorted in order to convey the irrational or fictive nature of reality and the essential isolation of humanity in a meaningless world.
theatre of the absurd — drama in which normal conventions and dramatic structure are ignored or modified in order to present life as irrational or meaningless
third-party insurance — insurance that compensates for a loss to a party other than the insured for which the insured is liable.
to be hard luck on sb — to be unfortunate or unlucky for someone
to rear its ugly head — If something unpleasant rears its head or rears its ugly head, it becomes visible or noticeable.

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