JOIST n.
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.…
LUMBER n.
Timber sawed or split into the form of beams, joists, boards, planks, staves, hoops, etc.; esp., that which is smaller than heavy timber. [U.S.] Lumber kiln, a room in which timber or lumber is dried by artificial heat. [U.S.] -- Lumber room, a room in which unused furniture or other lumber is kept. [U.S.] -- Lumber wa…