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

An ancillary of the brand’s best-selling, ambery-woody eau, each aluminum tube contains a quick-absorbing lotion that lavishes skin with moisture, keeping hands feeling comfortable and cuticles softened with its moisturizing blend of avocado oil, shea butter, plus green tea and chamomile extracts. —Sophia Panych, Allure, 16 Sep. 2025

The most prominent features of the Cygnus cargo freighter are its circular, fan-like solar arrays and an aluminum cylinder called the pressurized cargo module that bears some resemblance to a keg of beer. —Stephen Clark, ArsTechnica, 15 Sep. 2025

How Often To Clean A Range Hood Filter Range hood filters are standardly made of aluminum mesh, but some high-end models have steel or aluminum baffles. —Brandee Gruener, Southern Living, 15 Sep. 2025

The aluminum stand doesn’t look out of place next to a Mac and the ultra-thin bezel gives it a stylish look. —Mark Sparrow, Forbes.com, 14 Sep. 2025

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

Rhymes for aluminum

• aluminium

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