[ uh-loo-muh-nuh m ]
/ əˈlu mə nəm /


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.


of, relating to, or containing aluminum: an aluminum frying pan.
Also especially British, aluminium.

Origin of aluminum

1812; < New Latin, alteration, by Humphry Davy, of alumium, which was first proposed; aluminium formed after other metals in -ium. See alumina, -ium


al·u·min·ic [al-yuh-min-ik] /ˌæl yəˈmɪn ɪk/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for aluminum

Medical definitions for aluminum

[ ə-lōōmə-nəm ]

n. Symbol Al

A silvery-white, ductile metallic element used in making dental alloys and forming compounds with pharmaceutical uses, especially as astringents and antiseptics. Atomic number 13.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for aluminum

[ ə-lōōmə-nəm ]

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 26.9815; melting point 660.3°C (1,220.5°F); boiling point 2,519°C; specific gravity 2.70; valence 3. See Periodic Table.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.