1 a beam made of timber, steel, or reinforced concrete, used in the construction of floors, roofs, etc.
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2 tr to construct (a floor, roof, etc.) with joists (C14: from Old French giste beam supporting a bridge, from Vulgar Latin jacitum (unattested) support, from jacere to lie)
n a steel beam, esp. one with a cross section in the form of a letter H or I, (Abbrev)
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