Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of alumina is as below...

Wootz :: Wootz (n.) A species of steel imported from the East Indies, valued for making edge tools; Indian steel. It has in combination a minute portion of alumina and silica..

Epidote :: Epidote (n.) A mineral, commonly of a yellowish green (pistachio) color, occurring granular, massive, columnar, and in monoclinic crystals. It is a silicate of alumina, lime, and oxide of iron, or manganese..

Bole :: Bole (n.) Any one of several varieties of friable earthy clay, usually colored more or less strongly red by oxide of iron, and used to color and adulterate various substances. It was formerly used in medicine. It is composed essentially of hydrous silicates of alumina, or more rarely of magnesia. See Clay, and Terra alba..

Topaz :: Topaz (n.) A mineral occurring in rhombic prisms, generally yellowish and pellucid, also colorless, and of greenesh, bluish, or brownish shades. It sometimes occurs massive and opaque. It is a fluosilicate of alumina, and is used as a gem..

Harmotome :: Harmotome (n.) A hydrous silicate of alumina and baryta, occurring usually in white cruciform crystals; cross-stone..

Alum Stone :: Alum stone () A subsulphate of alumina and potash; alunite.

Aluminous :: Aluminous (a.) Pertaining to or containing alum, or alumina; as, aluminous minerals, aluminous solution..

Ralstonite :: Ralstonite (n.) A fluoride of alumina and soda occurring with the Greenland cryolite in octahedral crystals.

Feldspath :: Feldspath (n.) A name given to a group of minerals, closely related in crystalline form, and all silicates of alumina with either potash, soda, lime, or, in one case, baryta. They occur in crystals and crystalline masses, vitreous in luster, and breaking rather easily in two directions at right angles to each other, or nearly so. The colors are usually white or nearly white, flesh-red, bluish, or greenish..

Earth :: Earth (n.) Any earthy-looking metallic oxide, as alumina, glucina, zirconia, yttria, and thoria..

Alunogen :: Alunogen (n.) A white fibrous mineral frequently found on the walls of mines and quarries, chiefly hydrous sulphate of alumina; -- also called feather alum, and hair salt..

Hauynite :: Hauynite (n.) A blue isometric mineral, characteristic of some volcani/ rocks. It is a silicate of alumina, lime, and soda, with sulphate of lime..

Gibbsite :: Gibbsite (n.) A hydrate of alumina.

Aluminate :: Aluminate (n.) A compound formed from the hydrate of aluminium by the substitution of a metal for the hydrogen.

Cryolite :: Cryolite (n.) A fluoride of sodium and aluminum, found in Greenland, in white cleavable masses; -- used as a source of soda and alumina..

Sesquioxide :: Sesquioxide (n.) An oxide containing three atoms of oxygen with two atoms (or radicals) of some other substance; thus, alumina, Al2O3 is a sesquioxide..

Variscite :: Variscite (n.) An apple-green mineral occurring in reniform masses. It is a hydrous phosphate of alumina.

Wavellite :: Wavellite (n.) A hydrous phosphate of alumina, occurring usually in hemispherical radiated forms varying in color from white to yellow, green, or black..

Axinite :: Axinite (n.) A borosilicate of alumina, iron, and lime, commonly found in glassy, brown crystals with acute edges..

Aluminiform :: Aluminiform (a.) Having the form of alumina.

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