Adjacent Words

alumina definitions

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WordNet (r) 3.0 (2005)

n
1: any of various forms of aluminum oxide occurring naturally as corundum [syn: alumina, aluminum oxide, aluminium oxide]

Merriam Webster's

noun Etymology: New Latin, from Latin alumin-, alumen alum Date: 1801 the oxide of aluminum Al₂O₃ occurring native as corundum and in hydrated forms (as in bauxite)

Oxford Reference Dictionary

n. the compound aluminium oxide occurring naturally as corundum and emery. Etymology: L alumen alum, after soda etc.

Webster's 1913 Dictionary

Alumina A*lu"mi*na, n. [L. alumen, aluminis. See Alum.] (Chem.) One of the earths, consisting of two parts of aluminium and three of oxygen, Al2O3. Note: It is the oxide of the metal aluminium, the base of aluminous salts, a constituent of a large part of the earthy siliceous minerals, as the feldspars, micas, scapolites, etc., and the characterizing ingredient of common clay, in which it exists as an impure silicate with water, resulting from the decomposition of other aluminous minerals. In its natural state, it is the mineral corundum.

Soule's Dictionary of English Synonyms

n. Oxide of aluminum, argillaceous earth, argil.