Joist Definition

joist
joists
noun
Any of the parallel planks or beams that hold up the planks of a floor or the laths of a ceiling.
Webster's New World
verb
To provide with joists.
Webster's New World

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

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