Definition of aluminum
: 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 foilThe 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 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
Test Your Vocabulary
Challenging Words You Should Know
-
- Often used to describe “the march of time,” what does inexorable mean?

Test your visual vocabulary with our 10-question challenge!
TAKE THE QUIZ
A daily challenge for crossword fanatics.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Share aluminum
Time Traveler for aluminum
The first known use of aluminum was in 1812
See more words from the same year