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joist

[joist] /dʒɔɪst/
noun
1.
any of a number of small, parallel beams of timber, steel, reinforced concrete, etc., for supporting floors, ceilings, or the like.
verb (used with object)
2.
to furnish with or fix on joists.
Origin
1325-1375
1325-75; Middle English giste < Old French < Latin *jacitum support, noun use of neuter of Latin jacitus (past participle of jacēre to lie), equivalent to jaci- variant stem + -tus past participle suffix
Related forms
joistless, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for joists

joist

/dʒɔɪst/
noun
1.
a beam made of timber, steel, or reinforced concrete, used in the construction of floors, roofs, etc See also rolled-steel joist
verb
2.
(transitive) to construct (a floor, roof, etc) with joists
Word Origin
C14: from Old French giste beam supporting a bridge, from Vulgar Latin jacitum (unattested) support, from jacēre to lie
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for joists

joist

n.

early 14c. (late 13c. in Anglo-Latin), from Old French giste "beam supporting a bridge" (Modern French gîte), noun use of fem. past participle of gesir "to lie," from Latin iacere "to lie, rest," related to iacere "to throw" (see jet (v.)). Notion is of wooden beam on which boards "lie down."

Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Article for joists

joist

ceiling or floor support in building construction. Joists-of timber, steel, or reinforced concrete-are laid in a parallel series across or abutting girders or a bearing wall, to which they are attached, usually by metal supports called joist hangers, or anchors

Learn more about joist with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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