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The Collaborative International Dictionary of English v.0.48 (gcide)

Joist \Joist\ (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.
[1913 Webster]


Joist \Joist\, v. t. [imp. & p. p. {Joisted}; p. pr. & vb. n.
{Joisting}.]
To fit or furnish with joists. --Johnson.
[1913 Webster]