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
Sony wasn’t going to let the 1000X’s aluminum anniversary pass without a celebration.
—Bryan Hood, Robb Report, 19 May 2026
Also, this method has the potential to extract aluminum and iron from the rocks simultaneously, which adds more revenue opportunities for businesses that pursue it, even if the total cost isn’t as competitive as cooking limestone.
—Alex Knapp, Forbes.com, 18 May 2026
Known for creating minimal spaces using futuristic textures such as aluminum, the store continues Yoshioka’s obsession with creating a sense of lightness within the retail environment.
—Denni Hu, Footwear News, 18 May 2026
American steel and aluminum companies in particular have used this process to seek economic protection from cheaper foreign imports, according to Scott Lincicome, a trade expert at the libertarian Cato Institute.
—Maria Aspan, NPR, 17 May 2026
See All Example Sentences for aluminum
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Bryan Hood, Robb Report, 19 May 2026
Also, this method has the potential to extract aluminum and iron from the rocks simultaneously, which adds more revenue opportunities for businesses that pursue it, even if the total cost isn’t as competitive as cooking limestone.
—Alex Knapp, Forbes.com, 18 May 2026
Known for creating minimal spaces using futuristic textures such as aluminum, the store continues Yoshioka’s obsession with creating a sense of lightness within the retail environment.
—Denni Hu, Footwear News, 18 May 2026
American steel and aluminum companies in particular have used this process to seek economic protection from cheaper foreign imports, according to Scott Lincicome, a trade expert at the libertarian Cato Institute.
—Maria Aspan, NPR, 17 May 2026
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 May. 2026.
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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