I beam

noun

Definition of I beam

: an iron or steel beam that is I-shaped in cross section

First Known Use of I beam

circa 1889, in the meaning defined above

Keep scrolling for more

Learn More about I beam

Dictionary Entries near I beam

Ibanag

Ibáñez

I bar

I beam

Iberia

Iberian

Iberian ibex

Statistics for I beam

Look-up Popularity

Time Traveler for I beam

The first known use of I beam was circa 1889

See more words from the same year

More from Merriam-Webster on I beam

Rhyming Dictionary: Words that rhyme with I beam

Comments on I beam

What made you want to look up I beam? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

behavior toward others

Get Word of the Day daily email!

Test Your Vocabulary

Words for Summer: A Quiz

  • a closeup of a sunflower
  • Which of the following words means “of or relating to summer”?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!