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Definition of joist : 1. 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.
2. To fit or furnish with joists.

Synonyms:

scantling, post, support, strip

crossbeam, tie, lintel, transom, truss, beam, crosstie, spar, stud, transverse, sill, rafter, strut, girder, I beam, ridgepole

Usage examples:

• Near the uprights was an extra piece of joist standing on end as if forming a portion of the side. - "Down the Slope", James Otis.
• You may drag them off; but the first one who dares so much as raise a joist for any other purpose, shall suffer! - "Down the Slope", James Otis.
• A dull thud told of the trap fully raised and resting upon some supporting joist. - "The Devil Doctor", Sax Rohmer.