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

Before 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

Examples of aluminum in a Sentence

Recent Examples on the Web

The mechanism includes an aluminum satellite hour display on a brass carousel and features extensive hand-finishing, including circular graining and shot-blasting. —Matthew Catellier, Forbes, 22 Oct. 2024

The aluminum skin wrapped around an airframe is typically around a millimeter thick. —Ryan Erik King / Jalopnik, Quartz, 21 Oct. 2024

The frantic scene after an aluminum gangway collapsed Saturday at a boat dock on a Georgia barrier island capped what was supposed to have been a day of celebration, an annual festival spotlighting the culture and history of Sapelo Island's tiny Gullah-Geechee community of Black slave descendants. —CBS News, 21 Oct. 2024

The frantic scene after an aluminum gangway collapsed Saturday at a boat dock on a Georgia barrier island capped what was supposed to have been a day of celebration, an annual festival spotlighting the culture and history of Sapelo Island’s tiny Gullah-Geechee community of Black slave descendants. —Chloe Berger, Fortune, 21 Oct. 2024

Word History

Etymology

alumine "alumina" (borrowed from French, borrowed from Latin alūmin-, alūmen alum entry 1) + -um (in the names of other metals, as platinum entry 1, tantalum)

First Known Use

1812, in the meaning defined above

Phrases Containing aluminum

• aluminum foil
• aluminum oxide
• aluminum sulfate

Kids 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