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compact disc

(Encyclopedia)compact disc (CD), a small plastic disc used for the storage of digital data. As originally developed for audio systems, the sound signal is sampled at a rate of 44,100 times a second, then each sampl...

mercaptan

(Encyclopedia)mercaptan thīˈōl [key], any of a class of organic compounds containing the group –SH bonded to a carbon atom. The volatile low-molecular-weight mercaptans have disagreeable odors. Mercaptans are ...

microwave oven

(Encyclopedia)microwave oven, device that uses microwaves to rapidly cook food. The microwaves cause water molecules in the food to vibrate, producing heat, which is distributed through the food by induction. A spe...

monorail

(Encyclopedia)monorail, railway system that uses cars that run on a single rail. Typically the rail is run overhead and the cars are either suspended from it or run above it. Driving power is transmitted from the c...

raffia

(Encyclopedia)raffia rāˈfēə [key], fiber obtained from the raffia palm of Madagascar, exported for various uses, such as tying up plants that require support, binding together vegetables to be marketed, and wea...

marjoram

(Encyclopedia)marjoram or sweet marjoram märˈjərəm [key], Old World perennial aromatic herb (Marjorana hortensis) of the family Labiatae (mint family), cultivated in gardens for flavoring. The tops yield origan...

Aki, Keiiti

(Encyclopedia)Aki, Keiiti, 1930–2005, American seismologist, b. Yokohama, Japan, Ph.D. Univ. of Tokyo, 1958. Associated with the Univ. of Tokyo 's Earthquake Research Institute from 1963, Aki joined the faculty o...

defense mechanism

(Encyclopedia)defense mechanism, in psychoanalysis, any of a variety of unconscious personality reactions which the ego uses to protect the conscious mind from threatening feelings and perceptions. Sigmund Freud fi...

Fiedler, Leslie

(Encyclopedia)Fiedler, Leslie, 1917–2003, American critic, b. Newark, N.J., grad. New York Univ. (B.A. 1938), Univ. of Wisconsin (Ph.D. 1941). In his best-known and most controversial work, Love and Death in the ...

U , letter of the alphabet

(Encyclopedia)U, 21st letter of the alphabet, corresponding to the Greek upsilon [Gr.,=u without the aspirate]. Until the late Middle Ages the capital was V, the minuscule u, no distinction being made between the c...