aluminum
noun
alu·mi·num
ə-ˈlü-mə-nəm 
: a silver-white metallic chemical element with atomic number 13 that has good electrical and thermal conductivity, high reflectivity, and resistance to oxidation
—often used before another noun
aluminum foil
The sweet spot, the point in a bat where vibration supposedly is least, is said to be two times larger on an aluminum bat than on a wood one.—
Hank Hersch
Hank HerschBefore he evacuated, Mr. Gonzales tied the boat down with four gigantic ropes and all the storm could do was knock it off the construction blocks. He slowly climbs a battered aluminum ladder propped up on the port side.—Ken Wells
see Chemical Elements Table
Ken WellsExamples of aluminum in a Sentence
Recent Examples on the Web
The bloc also faces a U.S. duty of 25% for cars, steel and aluminum.
—Arkansas Online, 12 Apr. 2025
But here’s the catch: The United States still imposes 25 percent tariffs on cars, steel and aluminum from Canada, as well as any product with less North American content than demanded by the trade agreement between Canada, the United States and Mexico.
—Ian Austen, New York Times, 12 Apr. 2025
Those are in addition to $300 to $500 increases as a result of previously announced tariffs on steel and aluminum.
—Michael Wayland, CNBC, 12 Apr. 2025
Global tariffs were announced, amended or rescinded across February and March, with a number going into effect, for example, new tariffs on all steel and aluminum imports went into effect mid-March.
—Kirstie McDermott | This Column Was Created By Jobbio, The Hill, 11 Apr. 2025
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Arkansas Online, 12 Apr. 2025
But here’s the catch: The United States still imposes 25 percent tariffs on cars, steel and aluminum from Canada, as well as any product with less North American content than demanded by the trade agreement between Canada, the United States and Mexico.
—Ian Austen, New York Times, 12 Apr. 2025
Those are in addition to $300 to $500 increases as a result of previously announced tariffs on steel and aluminum.
—Michael Wayland, CNBC, 12 Apr. 2025
Global tariffs were announced, amended or rescinded across February and March, with a number going into effect, for example, new tariffs on all steel and aluminum imports went into effect mid-March.
—Kirstie McDermott | This Column Was Created By Jobbio, The Hill, 11 Apr. 2025
See All Example Sentences for aluminum
Cite this Entry
“Aluminum.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/aluminum. Accessed 22 Apr. 2025.
Copy CitationKids Definition
aluminum
noun
alu·mi·num
ə-ˈlü-mə-nəm
: a silver-white malleable light element that conducts electricity and heat well, is highly resistant to oxidation, and is the most abundant metal in the earth's crust see element
Medical Definition
aluminum
noun
alu·mi·num
ə-ˈlü-mə-nəm
: a silver-white malleable ductile light trivalent metallic chemical element with atomic number 13 that has good electrical and thermal conductivity, high reflectivity, and resistance to oxidation
—symbol Al
see Chemical Elements Table
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