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joist

noun [C]
 
 
/dʒɔɪst/

Definition

a long, thick piece of wood, metal, or concrete, used in buildings to support a floor or ceilingPhysical supports and supportingArches, columns and beamsArches, columns and beams
(Definition of joist noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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