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 giant aluminum and acrylic music note stands 16 feet tall and weighs around 400 pounds.
—Kate Perez, USA Today, 28 Dec. 2025
Some of the smaller gifts from the NFL star also included Beats Studio Pro headphones, Oakley Meta HSTN AI sunglasses, Rimowa aluminum suitcases and Aventon e-bikes.
—Desiree Anello, PEOPLE, 27 Dec. 2025
Skeptical or negative statements about aluminum have cropped up repeatedly during federal health announcements and meetings in recent months.
—Aria Bendix, NBC news, 26 Dec. 2025
Workers often strip the easy parts — the aluminum frames and the glass — while the precious, complex materials are lost or released into the environment.
—Mrigakshi Dixit, Interesting Engineering, 26 Dec. 2025
See All Example Sentences for aluminum
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Kate Perez, USA Today, 28 Dec. 2025
Some of the smaller gifts from the NFL star also included Beats Studio Pro headphones, Oakley Meta HSTN AI sunglasses, Rimowa aluminum suitcases and Aventon e-bikes.
—Desiree Anello, PEOPLE, 27 Dec. 2025
Skeptical or negative statements about aluminum have cropped up repeatedly during federal health announcements and meetings in recent months.
—Aria Bendix, NBC news, 26 Dec. 2025
Workers often strip the easy parts — the aluminum frames and the glass — while the precious, complex materials are lost or released into the environment.
—Mrigakshi Dixit, Interesting Engineering, 26 Dec. 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 1 Jan. 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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