Alumina
[ә'lu:minә]
Definition
(noun.) any of various forms of aluminum oxide occurring naturally as corundum.
Checker: Norris--From WordNet
Definition
(n.) One of the earths, consisting of two parts of aluminium and three of oxygen, Al2O3.
Inputed by Delia
Synonyms and Synonymous
n. Oxide of aluminum, argillaceous earth, argil.
Typed by Eugenia
Definition
n. one of the earths the characteristic ingredient of common clay—the oxide of aluminium.—adj. Alū′minous containing alum or alumina.
Inputed by Gustav
Examples
- The Cowles process heats to incandescence by the electric current a mixture of alumina, carbon and copper, the reduced aluminum alloying with the copper. Edward W. Byrn. The Progress of Invention in the Nineteenth Century.
- It has, however, for the most parts been superseded by the process patented by Hall, April 2, 1889, No. 400,766, in which alumina dissolved in fused cryolite is electrically decomposed. Edward W. Byrn. The Progress of Invention in the Nineteenth Century.
- The process of manufacture of rubies is carried on with the oxyhydrogen blow-pipe, to whose intense heat the powdered alumina with its coloring oxides is subjected. Various. The Wonder Book of Knowledge.
- Among other lining materials found suitable were soapstone, alumina, ammonia, copperas, starch, Epsom salts, and gypsum, paper, pulp, and alum, and a mixture of various other materials. William Henry Doolittle. Inventions in the Century.
- The ruby, chemically considered, is crystallized alumina, or oxide of aluminum, with a small percentage of oxide of chromium. Various. The Wonder Book of Knowledge.
Checked by Enrique