Joist meaning

joist
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Any of the wood, steel, or concrete beams set parallel from wall to wall or across or abutting girders to support a floor or ceiling.
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To construct with joists.
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Any of the parallel planks or beams that hold up the planks of a floor or the laths of a ceiling.
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To provide with joists.
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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.
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To fit or furnish with joists.
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Origin of joist

  • Middle English giste, joiste from Old French giste from feminine past participle of gesir to lie, lie down from Latin iacēre yē- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • Old French giste, feminine of gist, the past participle of gesir (“to lie down”).

    From Wiktionary