21-letter words containing u, d, o

purple-fringed orchid — either of two orchids, Habenaria fimbriata or H. psycodes, of eastern North America, having a cluster of fragrant purple flowers with a fringed lip.
purple-fringed orchis — either of two North American orchids (Habenaria psycodes and H. fimbriata) with purple-fringed flowers
pyrenean mountain dog — a large heavily built dog of an ancient breed originally used to protect sheep from wild animals: it has a long thick white coat with a dense ruff
quadralay corporation — (company) The developers of GWHIS. Telephone: +1 512-346-9199. Fax: +1 512-346-8990.
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.
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
remote procedure call — (networking, programming) (RPC) A protocol which allows a program running on one host to cause code to be executed on another host without the programmer needing to explicitly code for this. RPC is an easy and popular paradigm for implementing the client-server model of distributed computing. An RPC is initiated by the caller (client) sending request message to a remote system (the server) to execute a certain procedure using arguments supplied. A result message is returned to the caller. There are many variations and subtleties in various implementations, resulting in a variety of different (incompatible) RPC protocols.
residual unemployment — the unemployment that remains in periods of full employment, as a result of those mentally, physically, or emotionally unfit to work
richard coeur de lion — ("Richard the Lion-Hearted"; "Richard Coeur de Lion") 1157–99, king of England 1189–99.
ring down the curtain — to lower the curtain at the end of a theatrical performance
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.
round-necked pullover — a sweater with a plain round neckline
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.
santo tome de guayana — a city in NE Venezuela, on the Orinoco River.
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.
school superintendent — an official whose job is to oversee school administration within a district
shams ud-din mohammed — (Shams ud-din Mohammed) c1320–89? Persian poet.
silicon tetrafluoride — a colorless, fuming gas, SiF 4 , used chiefly in the manufacture of fluosilicic acid.
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.
sodium metabisulphite — an inorganic compound with the chemical formula Na2S2O5 that is used as a preservative, antioxidant and disinfectant
someone's name is mud — someone is disgraced
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
student participation — the extent to which students participate or involve themselves in a class, course, etc
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
supply-side economics — a school of economic thought that emphasizes the importance to a strong economy of policies that remove impediments to supply
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.
the household cavalry — a group of British soldiers on horseback who have the job of protecting the king or queen and their family
the moral high ground — If you say that someone has taken the moral high ground, you mean that they consider that their policies and actions are morally superior to the policies and actions of their rivals.
the slough of despond — a state of extreme despondency, depression or degradation
the student community — the body of students in further and higher education, considered as a whole
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
think outside the box — to think in a different, innovative, or original manner, esp with regard to business practices, products, systems, etc
third party procedure — impleader.
time and motion study — the systematic investigation and analysis of the motions and the time required to perform a specific operation or task with a view to seeking more efficient methods of production as well as setting time standards.
to be hard luck on sb — to be unfortunate or unlucky for someone
to be killed outright — If someone is killed outright, they die immediately, for example in an accident.
to be mixed up in sth — if you are mixed up in something, usually something bad, you are involved in it
to know your own mind — If you know your own mind, you are sure about your opinions, and are not easily influenced by other people.
to lay down your life — If someone lays down their life for another person, they die so that the other person can live.
to let your hair down — If you let your hair down, you relax completely and enjoy yourself.

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