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

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The first known use of I beam was circa 1889

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Cite this Entry

“I beam.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/I%20beam. Accessed 28 January 2020.

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