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photocopying
photocopying process whereby written or printed matter is directly copied by photographic techniques. Generally, photocopying is practical when just a few copies of an original are needed. When many copies are required, printing processes are more economical. However, when a printing process is u...
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blueprint
blueprint white-on-blue photographic print, commonly of a working drawing used during building or manufacturing. The plan is first drawn to scale on a special paper or tracing cloth through which light can penetrate. The drawing is then placed over blueprint paper, prepared with a mixture of potass...
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margin requirement
margin requirement that part of a security's price that a buyer must pay for in cash. The balance of the price is met by the broker, who, in effect, is supplying a client with a loan. The smaller the margin, the greater the inducement to speculation. Low margin requirements were considered an impor...
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countertenor
countertenor a male singing voice in the alto range. Singing in this range requires either a special vocal technique called falsetto, or a high extension of the tenor range. Countertenors were required during the Renaissance and Baroque periods when women were not permitted to sing publicly. Se...
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space shuttle
space shuttle Re-usable rocket-powered US spacecraft. The main part of the shuttle, the orbiter (of which four have been built, Columbia, Challenger, Discovery, and Atlantis), looks like a bulky jet aircraft with swept-back wings. It ferries people and equipment between the ground and Earth orbit. ...
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Statute of Frauds
Statute of Frauds basis of most modern laws requiring that certain promises must be in writing in order to be enforceable; it was passed by the English Parliament in 1677. In the United States, although state laws vary, most require written agreements in four types of contracts: contracts to assume...
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optician
optician filler of prescriptions for and dispenser of corrective lenses. An optician may grind lenses as instructed by the prescription of an optometrist (see optometry ) or ophthalmologist (see ophthalmology ) or transcribe the instructions for laboratory mechanics. The optician also fits and ad...
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prosthetic group
prosthetic group non-amino acid portions of certain protein molecules. The key part of the prosthetic group may be either organic (such as a vitamin ) or inorganic (such as a metal) and is usually required for biological activity, especially when the prosthetic group is complexed with an enzyme...
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Sporozoa
Sporozoa , phylum of unicellular heterotrophic organisms of the kingdom Protista . Unlike most other protozoans , sporozoans have no cilia or flagella. All species are parasitic and have elaborate life cycles, often requiring more than one host. The best-known sporozoan is Plasmodium falciparum, ...
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wen
wen benign, slow-growing, painless cyst of the skin resulting from obstruction of the sebaceous gland ducts. It is frequently found on the scalp, ears, face, back, or scrotum. Usually no treatment is required. Large wens may be surgically removed.
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