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a·lu·mi·num 
Audio Help [uh-loo-muh-nuhm] Pronunciation Key
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Audio Help [uh-loo-muh-nuhm] Pronunciation Key –noun
–adjective
| 1. | Chemistry. a silver-white metallic element, light in weight, ductile, malleable, and not readily corroded or tarnished, occurring combined in nature in igneous rock, shale, clay, and most soil: used in alloys and for lightweight utensils, castings, airplane parts, etc. Abbreviation: alum.; Symbol: Al; atomic weight: 26.98; atomic number: 13; specific gravity: 2.70 at 20°C. |
| 2. | of, pertaining to, or containing aluminum: an aluminum frying pan. |
Also, especially British, aluminium.
[Origin: 1812; < NL, alter., by Humphry Davy, of alumium, which was first proposed; aluminium formed after other metals in -ium. See alumina, -ium]
] —Related forms
| Dictionary.com Unabridged (v 1.1) Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006. |
aluminum
To learn more about aluminum visit Britannica.com
| © 2008 Encyclopædia Britannica, Inc. |
| a·lu·mi·num
Audio Help (ə-lōō'mə-nəm) Pronunciation Key
n. Symbol Al A silvery-white, ductile metallic element, the most abundant in the earth's crust but found only in combination, chiefly in bauxite. Having good conductive and thermal properties, it is used to form many hard, light, corrosion-resistant alloys. Atomic number 13; atomic weight 26.98; melting point 660.2°C; boiling point 2,467°C; specific gravity 2.69; valence 3. See Table at element. [alumin(a) + -(i)um.] |
| The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2006 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved. |
aluminum
1812, coined by Sir Humphry Davy (1778-1829), from L. alumen "alum" (see alum). Davy originally called it alumium (1808), then amended this to aluminum, which remains the U.S. word, but British editors in 1812 further amended it to aluminium, the modern preferred British form, to better harmonize with other element names (sodium, potassium, etc.).
"Aluminium, for so we shall take the liberty of writing the word, in preference to aluminum, which has a less classical sound." ["Quarterly Review," 1812]
| Online Etymology Dictionary, © 2001 Douglas Harper |
| aluminum | |
noun | |
| a silvery ductile metallic element found primarily in bauxite |
| WordNet® 3.0, © 2006 by Princeton University. |
aluminum
Audio Help (ə-l 'mə-nəm) Pronunciation Key
Symbol Al A lightweight, silvery-white metallic element that is ductile, is found chiefly in bauxite, and is a good conductor of electricity. It is the most abundant metal in the Earth's crust and is used to make a wide variety of products from soda cans to airplane components. Atomic number 13; atomic weight 26.98; melting point 660.2°C (1,220.36°F); boiling point 2,467°C; specific gravity 2.69; valence 3. See Periodic Table. |
| The American Heritage® Science Dictionary Copyright © 2002 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved. |
Aluminum
A*lu"mi*num\ ([.a]*l[=u]*m[i^]*n[u^]m), n. See Aluminium.| Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc. |
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