Definition of I beam
: an iron or steel beam that is I-shaped in cross section
Test Your Vocabulary
Name That Food
-
- Name these cookies!

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 I beam
Time Traveler for I beam
The first known use of I beam was circa 1889
See more words from the same year