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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 of joist
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. 2015.
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British Dictionary definitions for joist

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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for 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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12
14
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