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 Trump administration used this statute to implement 25% tariffs on steel and aluminum in March.
—Jill Goldenziel, Forbes.com, 1 June 2025
The build quality is solid with an aluminum frame that has heft.
—Gieson Cacho, Mercury News, 31 May 2025
President Trump’s plan to double tariffs on foreign steel and aluminum could have sweeping effects on projects across Maryland.
—Todd Karpovich, Baltimore Sun, 31 May 2025
Spike in steel tariffs could imperil Trump promise of lower grocery prices
President Trump’s doubling of tariffs on foreign steel and aluminum could hit Americans in an unexpected place: grocery aisles.
—Boston Herald Wire Services, Boston Herald, 31 May 2025
See All Example Sentences for aluminum
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Jill Goldenziel, Forbes.com, 1 June 2025
The build quality is solid with an aluminum frame that has heft.
—Gieson Cacho, Mercury News, 31 May 2025
President Trump’s plan to double tariffs on foreign steel and aluminum could have sweeping effects on projects across Maryland.
—Todd Karpovich, Baltimore Sun, 31 May 2025
Spike in steel tariffs could imperil Trump promise of lower grocery prices
President Trump’s doubling of tariffs on foreign steel and aluminum could hit Americans in an unexpected place: grocery aisles.
—Boston Herald Wire Services, Boston Herald, 31 May 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 4 Jun. 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
Love words? Need even more definitions?
Merriam-Webster unabridged
Share