Joist

Pronunciation

• Rhymes: -ɔɪst

Origin

Old French giste, feminine of gist, the past participle of gesir ("to lie down").

Full definition of joist

Noun

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.

Verb

1. (transitive) To fit or furnish with joists.