Columbia Encyclopedia

Search results

500 results found

Plesiosaurus

(Encyclopedia)Plesiosaurus plēˌsēəsôrˈəs [key], genus of extinct predatory marine reptiles that arose in the Triassic period of geologic time and continued into the Jurassic and Cretaceous periods. Plesiosau...

electronic mail

(Encyclopedia)electronic mail or e-mail, the electronic transmission of messages, letters, and documents. In its broadest sense electronic mail includes point-to-point services such as telegraph and facsimile (fax)...

computer program

(Encyclopedia)computer program, a series of instructions that a computer can interpret and execute; programs are also called software to distinguish them from hardware, the physical equipment used in data processin...

Interior, United States Department of the

(Encyclopedia)Interior, United States Department of the, federal executive department established in 1849, delegated custodian of U.S. natural resources, and whose head, the Secretary of the Interior, has cabinet r...

Jacobs, Jane

(Encyclopedia)Jacobs, Jane, 1916–2006, American-Canadian urbanologist, b. Scranton, Pa., as Jane Butzner. She moved to New York City in the 1930s, was an editor (1952–64) of Architectural Forum magazine, and wr...

lamp

(Encyclopedia)lamp, originally a vessel for holding oil or some combustible substance that could be burned through a wick for illumination; the term has been extended to other lighting devices. Stones, shells, and ...

Boleyn, Anne

(Encyclopedia)Boleyn, Anne bo͝olˈĭn, bo͝olĭnˈ [key], 1507?–1536, second queen consort of Henry VIII and mother of Elizabeth I. She was the daughter of Sir Thomas Boleyn, later earl of Wiltshire and Ormonde,...

Gettysburg Address

(Encyclopedia)Gettysburg Address, speech delivered by Abraham Lincoln on Nov. 19, 1863, at the dedication of the national cemetery on the Civil War battlefield of Gettysburg, Pa. It is one of the most famous and mo...

marsupial

(Encyclopedia)marsupial märso͞oˈpēəl [key], member of the order Marsupialia, or pouched mammals. With the exception of the New World opossums and an obscure S American family (Caenolestidae), marsupials are no...

modulation, in communications

(Encyclopedia)CE5 Modulation modulation, in communications, process in which some characteristic of a wave (the carrier wave) is made to vary in accordance with an information-bearing signal wave (the modulatin...