Definitions for: Joist

[n] beam used to support floors or roofs

Webster (1913) Definition: Joist, n. [OE. giste, OF. giste, F. g[^i]te, fr. gesir
to lie, F. g['e]sir. See Gist.] (Arch.)
A piece of timber laid horizontally, or nearly so, to which
the planks of the floor, or the laths or furring strips of a
ceiling, are nailed; -- called, according to its position or
use, binding joist, bridging joist, ceiling joist,
trimming joist, etc. See Illust. of Double-framed floor,
under Double, a.

Joist, v. t. [imp. & p. p. Joisted; p. pr. & vb. n.
To fit or furnish with joists. --Johnson.

See Also: beam, floor joist, trimmer, trimmer joist

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