al·u·min·i·um (?l?y?-m?n??-?m)n. Chiefly British Variant of aluminum.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.aluminium (?ælj??m?n??m) or aluminumn (Elements & Compounds) a light malleable ductile silvery-white metallic element that resists corrosion; the third most abundant element in the earth’s crust (8.1 per cent), occurring only as a compound, principally in bauxite. It is used, esp in the form of its alloys, in aircraft parts, kitchen utensils, etc. Symbol: Al; atomic no: 13; atomic wt: 26.9815; valency: 3; relative density: 2.699; melting pt: 660.45°C; boiling pt: 2520°CCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014a?lu?mi?num (??lu m? n?m) n. 1. a silver-white metallic element, light in weight, ductile, malleable, and not readily corroded or tarnished: used in alloys and for lightweight products. Abbr.: alum.;Symbol: Al; at. wt.: 26.98; at. no.: 13; sp. gr.: 2.70 at 20°C. adj. 2. of, pertaining to, or containing aluminum. Also, esp. Brit., aluminium. [1812; alter. of earlier alumium. See alumina, -ium2] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.aluminiumaluminumDictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited