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Definition of joist noun from the Oxford Advanced Learner's Dictionary

joist

noun
 
/dʒɔɪst/
 
/dʒɔɪst/
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  1. a long thick piece of wood or metal that is used to support a floor or ceiling in a building
    • Lift any loose floorboards and inspect the joists.
    Extra Examples
    • Check that all the floorboards are securely attached to their joists.
    • Features of note include exposed ceiling joists and original stone fireplaces.
    • The joists are then nailed into position.
    Topics Buildingsc2
    Word Originlate Middle English giste, from Old French, ‘beam supporting a bridge’, based on Latin jacere ‘lie down’.
See joist in the Oxford Advanced American Dictionary
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noun
 
 
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