Columbia Encyclopedia

Search results

500 results found

contract

(Encyclopedia)contract, in law, a promise, enforceable by law, to perform or to refrain from performing some specified act. In a general sense, all civil obligations fall under tort or contract law. Torts are usual...

ant

(Encyclopedia)ant, any of the 2,500 insect species constituting the family Formicidae of the order Hymenoptera, to which the bee and the wasp also belong. Like most members of the order, ants have a “wasp waist,�...

ion, in chemistry

(Encyclopedia)ion, atom or group of atoms having a net electric charge. Ionization has many applications. Vapor lamps and fluorescent lamps take advantage of the light given off when positive ions recombine with ...

sound

(Encyclopedia)CE5 Sound waves: An air pressure wave radiating outward from a loudspeaker is perceived as sound. sound, any disturbance that travels through an elastic medium such as air, ground, or water to be ...

neuritis

(Encyclopedia)neuritis no͝orīˈtĭs, nyo͝o– [key], inflammation of a peripheral nerve, often accompanied by degenerative changes in nervous tissue. The cause can be mechanical (injury, pressure), vascular (occ...

litmus

(Encyclopedia)litmus, organic dye usually used in the laboratory as an indicator of acidity or alkalinity (see acids and bases). Naturally pink in color, it turns blue in alkali solutions and red in acids. Commonly...

model and modeling

(Encyclopedia)model and modeling, in painting, the use of light and shade to simulate volume in the representation of solids. In sculpture the terms denote a technique involving the use of a pliable material such a...

molecular modeling

(Encyclopedia)molecular modeling, the computer simulation, by various means, of chemical structures or processes. Special computer-graphics programs can display three-dimensional images of molecular structures and ...

La Trémoille, Louis de

(Encyclopedia)La Trémoille or La Trimouille, Louis de də lä trāmoiˈyə or trēmo͞oˈyə [key], 1460–1525, French general; grandson of Georges de La Trémoille. He commanded the army that attempted to secur...

mah jongg

(Encyclopedia)mah jongg mä jông [key], four-handed game, probably of Chinese origin, popular in the United States. It is played in many variations throughout China. In 1920, Joseph P. Babcock, an American travele...