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 aluminum frame benefits from a relatively low step-over height for easy on and off.
—New Atlas, 19 July 2025
Most folks install them on the side of their house, so the batteries come in a choice of aluminum, carbon fiber, or walnut finishes.
—Julian Chokkattu, Wired News, 19 July 2025
The frame of this chaise—aluminum covered in matte black powder coating—is lightweight enough to pick up and move around as the sun travels through the sky (i.e. great for sunbathing).
—Erika Owen, Architectural Digest, 18 July 2025
The aluminum frame curves in to merge seamlessly with the front and rear glass panels.
—ArsTechnica, 18 July 2025
See All Example Sentences for aluminum
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New Atlas, 19 July 2025
Most folks install them on the side of their house, so the batteries come in a choice of aluminum, carbon fiber, or walnut finishes.
—Julian Chokkattu, Wired News, 19 July 2025
The frame of this chaise—aluminum covered in matte black powder coating—is lightweight enough to pick up and move around as the sun travels through the sky (i.e. great for sunbathing).
—Erika Owen, Architectural Digest, 18 July 2025
The aluminum frame curves in to merge seamlessly with the front and rear glass panels.
—ArsTechnica, 18 July 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 23 Jul. 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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