21-letter words containing d, o, r, a

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.
social administration — the administration and maintenance of issues to do with social policies and welfare
somatization disorder — a mental illness, usually beginning before age 20, characterized by multiple physical complaints for which no physical causes can be found and often leading to unnecessary treatment or surgery and to severe disability.
sovereign wealth fund — an investment fund created using the financial assets of a national government
special correspondent — a journalist who covers stories firsthand from a war zone
spherical coordinates — Usually, spherical coordinates. any of three coordinates used to locate a point in space by the length of its radius vector and the angles this vector makes with two perpendicular polar planes.
staffordshire terrier — former name of American Staffordshire terrier.
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 response — A steady-state response is the behavior of a circuit after a long time when steady conditions have been reached after an external excitation.
step-down transformer — a device that transfers an alternating current from one circuit to one or more other circuits with a decrease of voltage
stock list department — (in an American stock exchange) the department dealing with monitoring compliance with its listing requirements and rules
stokes-adams syndrome — unconsciousness accompanying atrioventricular heart block, sometimes characterized by weakness, irregular pulse, and intermittent convulsive or nonconvulsive seizures.
strategic air command — a U.S. Air Force command charged with intercontinental air strikes, especially nuclear attacks.
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
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.
synchrotron radiation — electromagnetic radiation emitted by charged particles as they pass through magnetic fields.
take sb at their word — If you take someone at their word, you believe what they say, when they did not really mean it or when they meant something slightly different.
terrestrial radiation — long-wave electromagnetic radiation in the form of heat emitted from the earth's surface and atmosphere.
the break of day/dawn — The break of day or the break of dawn is the time when it begins to grow light after the night.
the comrades marathon — an annual long-distance race run every year on the 16th of June from Durban to Pietermaritzburg, a distance of approximately 90 kilometres (56 miles)
the fall of the cards — the chance distribution of cards in a given deal
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 order of the bath — an order of knighthood founded by George I in 1725. It consists of the sovereign, the Great Master, and three classes of member: Knight (or Dame) Grand Cross, Knight (or Dame) Commander, and Companion
the women's land army — a unit of women recruited to do agricultural work in the United Kingdom during World War I and World War II
the yellow brick road — the road to success or happiness (in the film the Wizard of Oz the yellow brick road leads to Oz)
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
thermal decomposition — Thermal decomposition is the process in which a chemical species breaks down when its temperature is increased.
third party procedure — impleader.
threshold wage policy — a policy whereby wages are increased in accordance with inflation
tide-generating force — the difference between the force of gravity exerted by the moon or the sun on a particle of water in the ocean and that exerted on an equal mass of matter at the centre of the earth. The lunar tide-generating forces are about 2.2 times greater than are the solar ones
to be arrayed against — to be opposed to
to be hard luck on sb — to be unfortunate or unlucky for someone
to be in dire straits — to be in a position of acute difficulty
to bend someone's ear — If you say that someone is bending your ear about something, you mean that they keep talking to you about it because they think it is important; used especially when you are irritated by this.
to kill a mockingbird — a novel (1960) by Harper Lee.
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.
to play the race card — if someone plays the race card they bring up the issue of race in a discussion, perhaps for sympathy or to seek popularity by appealing to racist sentiment
to rear its ugly head — If something unpleasant rears its head or rears its ugly head, it becomes visible or noticeable.
to risk life and limb — If someone risks life and limb, they do something very dangerous that may cause them to die or be seriously injured.
to sow your wild oats — If a young person sows their wild oats, they behave in a rather uncontrolled way, especially by having a lot of sexual relationships.
to take the high road — to take the course of action which is safest and most familiar
to take your mind off — If something takes your mind off a problem or unpleasant situation, it helps you to forget about it for a while.

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