Columbia Encyclopedia

Search results

500 results found

electrolyte

(Encyclopedia)electrolyte ĭlĕkˈtrəlītˌ [key], electrical conductor in which current is carried by ions rather than by free electrons (as in a metal). Electrolytes include water solutions of acids, bases, or s...

harpoon

(Encyclopedia)harpoon härpo͞onˈ [key], weapon used for spearing whales and large fish. The early type was a flat triangular piece of metal with barbed edges and a socket for attaching a wooden handle, to the end...

Hasan

(Encyclopedia)Hasan häsänˈ [key], c.625–c.669; son of Ali and Fatima (daughter of Muhammad the Prophet). When Ali was killed in 661, Hasan became caliph, but he was not strong enough to withstand the threat of...

butane

(Encyclopedia)butane byo͞oˈtān [key], C4H10, gaseous alkane, a hydrocarbon that is obtained from natural gas or by refining petroleum. It can be liquefied at room temperature by compression. There are two struct...

plywood

(Encyclopedia)plywood, manufactured board composed of an odd number of thin sheets of wood glued together under pressure with grains of the successive layers at right angles. Laminated wood differs from plywood in ...

vomiting

(Encyclopedia)vomiting, ejection of food and other matter from the stomach through the mouth, often preceded by nausea. The process is initiated by stimulation of the vomiting center of the brain by nerve impulses ...

lobbying

(Encyclopedia)lobbying, practice and profession of influencing governmental decisions, carried out by agents who present the concerns of special interests to legislators and administrators. The term originated in t...

pneumatic tool

(Encyclopedia)pneumatic tool no͝omătˈĭk [key], instrument activated by air pressure. Pneumatic tools are designed around three basic devices: the air cylinder, the vane motor, and the sprayer. The air cylinder ...

Murad II

(Encyclopedia)Murad II, 1403–51, Ottoman sultan (1421–51), son and successor of Muhammad I to the throne of the Ottoman Empire (Turkey). He was opposed at his accession by a pretender, Mustafa, who rapidly gain...

La Bourdonnais, Bertrand François, comte Mahé de

(Encyclopedia)La Bourdonnais, Bertrand François, comte Mahé de bĕrträNˈ fräNswäˈ, kôNt mäāˈ də lä bo͝ordônāˈ [key], 1699–1753, French naval officer. He entered the service of the French India Co...