Joist

A length of timber or steel supporting part of the structure of ...
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Term:Joist

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A length of timber or steel supporting part of the structure of a building, typically arranged in parallel series to support a floor or ceiling and perpendicular to a beam.

Merriam-Webster Online Dictionary
joist (noun)
any of the small timbers or metal beams ranged parallel from wall to wall in a structure to support a floor or ceiling
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