Alumina
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}. [1913 Webster]

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. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • alumină — ALUMÍNĂ s.f. 1. Oxid de aluminiu. 2. (În forma alumin) Varietate de caolin, folosită în industria cauciucului. [var.: alumín s.n.] – Din fr. alumine. Trimis de ana zecheru, 13.09.2007. Sursa: DEX 98  ALUMÍNĂ s. v. oxid de aluminiu. Trimis de… …   Dicționar Român

  • Alumina — Logo de Alumina Création 2003 …   Wikipédia en Français

  • Alumina — bezeichnet: Königlich Kopenhagen, Manufaktur der Königlichen Porzellanfabrik in Dänemark Alumina Limited, australisches Unternehmen der Aluminiumproduktion Transparente Form von Aluminiumoxid, einer Oxidkeramik …   Deutsch Wikipedia

  • alumina — s. f. Óxido de alumínio (Al2O3) que diversamente colorido constitui algumas pedras preciosas (safiras, rubis, etc.), e que é empregado no fabrico de porcelanas e faianças. (A alumina hidratada existe na natureza [bauxita].) …   Dicionário da Língua Portuguesa

  • Alumīna — (Chem.), Thonerde …   Pierer's Universal-Lexikon

  • Alumĭna — (lat.), Tonerde; A. hydrata, Tonerdehydrat …   Meyers Großes Konversations-Lexikon

  • alúmina — (no contable) sustantivo femenino 1. Área: química Óxido de aluminio que, forma feldespatos o arcillas, combinado con ciertos óxidos, y, cristalizado, el rubí o el corindón …   Diccionario Salamanca de la Lengua Española

  • alúmina — (Del lat. alūmen, ĭnis, alumbre). f. Quím. Óxido de aluminio que se halla en la naturaleza algunas veces puro y cristalizado, y por lo común formando, en combinación con la sílice y otros cuerpos, los feldespatos y las arcillas …   Diccionario de la lengua española

  • alumina — [ə lo͞o′mə nə] n. [ModL < L alumen (gen. aluminis), ALUM1] an oxide of aluminum, Al2O3, present in bauxite and clay and found as different forms of corundum, including emery, sapphires, and rubies …   English World dictionary

  • alumina — /euh looh meuh neuh/, n. the natural or synthetic oxide of aluminum, Al2O3, occurring in nature in a pure crystal form as corundum. Also called aluminum oxide. [1780 90; < L alumin , s. of alumen ALUM1 + A4] * * * ▪ chemical compound… …   Universalium

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