Columbia Encyclopedia

Search results

500 results found

cocaine

(Encyclopedia)cocaine kōkānˈ, kōˈkān [key], alkaloid drug derived from the leaves of the coca shrub. A commonly abused illegal drug, cocaine has limited medical uses, most often in surgical applications that ...

deafness

(Encyclopedia)deafness, partial or total lack of hearing. It may be present at birth (congenital) or may be acquired at any age thereafter. A person who cannot detect sound at an amplitude of 20 decibels in a frequ...

Dewey, John

(Encyclopedia)Dewey, John, 1859–1952, American philosopher and educator, b. Burlington, Vt., grad. Univ. of Vermont, 1879, Ph.D. Johns Hopkins, 1884. He taught at the universities of Minnesota (1888–89), Michig...

compressor

(Encyclopedia)compressor, machine that decreases the volume of air or other gas by the application of pressure. Compressor types range from the simple hand pump and the piston-equipped compressor used to inflate ti...

fertility drug

(Encyclopedia)fertility drug, any of a variety of substances used to increase the possibility of conception and successful pregnancy. Different methods are used to correct or circumvent the many different functiona...

Hawking, Stephen William

(Encyclopedia)Hawking, Stephen William, 1942–2018, British theoretical physicist, b. Oxford, England, grad. University College, Oxford, 1962, Ph.D. Trinity Hall, Cambridge, 1966. In 1962 Hawking was diagnosed as ...

Bell, Alexander Graham

(Encyclopedia)Bell, Alexander Graham, 1847–1922, American scientist, inventor of the telephone, b. Edinburgh, Scotland, educated at the Univ. of Edinburgh and University College, London; son of Alexander Melville...

Joyce, James

(Encyclopedia)Joyce, James, 1882–1941, Irish novelist. Perhaps the most influential and significant novelist of the 20th cent., Joyce was a master of the English language, exploiting all of its resources. His nov...

Diocletian

(Encyclopedia)Diocletian (Caius Aurelius Valerius Diocletianus) dīˈəklēˈshən [key], 245–313, Roman emperor (284–305), b. near Salona, Dalmatia (the modern Split, Croatia). Of humble birth, he obtained hig...

DeLay, Tom

(Encyclopedia)DeLay, Tom (Thomas Dale DeLay), 1947–, American politician, b. Laredo, Tex., grad. Univ. of Houston (B.S., 1970). A conservative Republican businessman, he entered politics (1979) as a Texas state l...