I-beam

I-beam

[ahy-beem]
noun
a rolled or extruded metal beam having a cross section resembling an I.

Origin:
1890–95

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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I-beam
 
n
Compare H-beam a rolled steel joist or a girder with a cross section in the form of a capital letter I

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