variant of , especially before a vowel.
the natural or synthetic oxide of aluminum, Al 2 O 3 , occurring in nature in a pure crystal form as corundum. Historical Examples The garnet is but as hard as quartz, and is a silicate of alumina with lime and a little iron. The A B C of Mining Charles A. Bramble It is […]
- Alumina cement
a quick-setting cement with a large bauxite content.
- Alumina trihydrate
. a crystalline, water-insoluble powder, Al(OH) 3 or Al 2 O 3 ⋅3H 2 O, obtained chiefly from bauxite: used in the manufacture of glass, ceramics, and printing inks, in dyeing, and in medicine as an antacid and in the treatment of ulcers.
Chemistry. a silver-white metallic element, light in weight, ductile, malleable, and not readily corroded or tarnished, occurring combined in nature in igneous rock, shale, clay, and most soil: used in alloys and for lightweight utensils, castings, airplane parts, etc. Symbol: Al; atomic weight: 26.98; atomic number: 13; specific gravity: 2.70 at 20°C. Abbreviation: alum.; of, […]