Definition of joist

Definition of joist
  1. joist Noun 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.
  2. joist Verb To fit or furnish with joists.
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