joists

joist

[joist]
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:
1325–75; 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

joistless, adjective
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World English Dictionary
joist (dʒɔɪst)
 
n
1.  See also rolled-steel joist a beam made of timber, steel, or reinforced concrete, used in the construction of floors, roofs, etc
 
vb
2.  (tr) to construct (a floor, roof, etc) with joists
 
[C14: from Old French giste beam supporting a bridge, from Vulgar Latin jacitum (unattested) support, from jacēre to lie]

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Etymonline
Word Origin & History

joist
late 14c. (attested from 1294 in Anglo-L.), from O.Fr. giste "beam supporting a bridge" (Mod.Fr. gîte), noun use of fem. pp. of gesir "to lie," from L. jacere "to lie, rest," related to jacere "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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Synonyms
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