joist Hear it!

joist definition

joist (jo̵ist)

noun

any of the parallel planks or beams that hold up the planks of a floor or the laths of a ceiling

Etymology: ME giste < OFr, a bed, couch, beam < gesir, to lie < L jacere, to lie, throw: see jet

transitive verb

to provide with joists

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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