21-letter words containing d, o, n, t, a

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.
terrestrial radiation — long-wave electromagnetic radiation in the form of heat emitted from the earth's surface and atmosphere.
the antipodes islands — a group of small uninhabited islands in the South Pacific, southeast of and belonging to New Zealand. Area: 62 sq km (24 sq miles)
the assessment method — a way of providing evidence that students' knowledge and learning match the aims of a course
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 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 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
thermal decomposition — Thermal decomposition is the process in which a chemical species breaks down when its temperature is increased.
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
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 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 fly off the handle — If you fly off the handle, you suddenly and completely lose your temper.
to hit the bookstands — (of a book) to be published
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 live hand to mouth — If someone lives hand to mouth or lives from hand to mouth, they have hardly enough food or money to live on.
to play second fiddle — If you play second fiddle to someone, your position is less important than theirs in something that you are doing together.
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 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.
tool command language — (language) /tik*l/ (Tcl) An interpreted string processing language for issuing commands to interactive programs, developed by John Ousterhout at UCB. Each application program can extend tcl with its own set of commands. Tcl is like a text-oriented Lisp, but lets you write algebraic expressions for simplicity and to avoid scaring people away. Though originally designed to be a "scripting language" rather than for serious programming, Tcl has been used successfully for programs with hundreds of thousands of lines. It has a peculiar but simple syntax. It may be used as an embedded interpreter in application programs. It has exceptions and packages (called libraries), name-spaces for procedures and variables, and provide/require. It supports dynamic loading of object code. It is eight-bit clean. It has only three variable types: strings, lists and associative arrays but no structures. Tcl and its associated GUI toolkit, Tk run on all flavors of Unix, Microsoft Windows, Macintosh and VMS. Tcl runs on the Amiga and many other platforms. See also expect (control interactive programs and pattern match on their output), Cygnus Tcl Tools, [incr Tcl] (adds classes and inheritence to Tcl), Scriptics (John Ousterhout's company that is the home of Tcl development and the TclPro tool suite), Tcl Consortium (a non-profit agency dedicated to promoting Tcl), tclhttpd (an embeddable Tcl-based web server), tclx (adds many commands to Tcl), tcl-debug.
trades union congress — The Trades Union Congress in Britain is the same as the TUC.
under one's own steam — If you do something under your own steam, you do it without any help from anyone else.
universal disk format — (storage, standard) (UDF) A CD-ROM file system standard that is required for DVD ROMs. UDF is the OSTA's replacement for the ISO 9660 file system used on CD-ROMs, but will be mostly used on DVD. DVD multimedia disks use UDF to contain MPEG audio and video streams. To read DVDs you need a DVD drive, the kernel driver for the drive, MPEG video support, and a UDF driver. DVDs containing both UDF filesystems and ISO 9660 filesystems can be read without UDF support. UDF can also be used by CD-R and CD-RW recorders in packet writing mode.
university of iceland — (body, education) The Home of Fjolnir.
vladivostok agreement — a preliminary arms control accord concluded by Soviet leader Leonid Brezhnev and U.S. President Gerald Ford in Vladivostok, U.S.S.R., in December 1974.
voluntary liquidation — the process of voluntarily terminating the affairs of a business, firm, etc, by realizing its assets to discharge its liabilities or the state of a business firm, etc, having its affairs so terminated
washington's birthday — February 22, formerly observed as a legal holiday in most states of the U.S. in honor of the birth of George Washington.
whip-and-tongue graft — a graft prepared by cutting both the scion and the stock in a sloping direction and inserting a tongue in the scion into a slit in the stock.
white-crowned sparrow — a North American sparrow, Zonotrichia leucophrys, having black and white stripes on the head.
with one's bare hands — If someone does something with their bare hands, they do it without using any weapons or tools.
word association test — a technique for determining a subject's associative pattern by providing a verbal stimulus to which a verbal response is required.
word-association test — a psychological test in which the person being tested responds to a given word with the first word (or the first word in a specified category, such as an antonym) brought to mind
xeroderma pigmentosum — a rare inherited disease characterized by sensitivity to ultraviolet light, exposure resulting in lesions and tumors of the skin and eyes.

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