GNU Collaborative International Dictionary of English

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Found 2 definitions 

  1.       
Joist (joist), n. [OE. giste, OF. giste, F. gîte, fr. gesir to lie, F. gésir. See Gist.] (Arch.) A piece of timber laid horizontally, or nearly so, to which the planks of the floor, or the laths or furring strips of a ceiling, are nailed; -- called, according to its position or use, binding joist, bridging joist, ceiling joist, trimming joist, etc. See Illust. of Double-framed floor, under Double, a.

    [1913 Webster]

    
      
    
  2.       
Joist, v. t. [imp. & p. p. Joisted; p. pr. & vb. n. Joisting.] To fit or furnish with joists.  Johnson.

    [1913 Webster]

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