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nounany of various forms of aluminum oxide occurring naturally as corundum
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Definition that contains alumina
- ochre any of various earths containing silica and alumina and ferric oxide; used as a pigment
- ocher any of various earths containing silica and alumina and ferric oxide; used as a pigment
- aluminate a compound of alumina and a metallic oxide
- chrysoberyl a rare hard yellow green mineral consisting of beryllium aluminate in crystal form; used as a gemstone
- cobalt blue greenish-blue pigment consisting essentially of cobalt oxide and alumina
- gibbsite white crystalline mineral consisting of aluminum hydroxide; a constituent of bauxite and a source of alumina
- cobalt ultramarine greenish-blue pigment consisting essentially of cobalt oxide and alumina
- alundum a substance made of fused alumina