joist

Noun
  1. Beam used to support floors or roofs (synset 103607053)
    is a type of: beam - long thick piece of wood or metal or concrete, etc., used in construction
    subtypes:
    • floor joist - joist that supports a floor
    • trimmer, trimmer joist - joist that receives the end of a header in floor or roof framing in order to leave an opening for a staircase or chimney etc.

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