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.…
KEELSON n.
A piece of timber in a ship laid on the middle of the floor timbers over the keel, and binding the floor timbers to the keel; in iron vessels, a structure of plates, situated like the keelson of a timber ship. Cross keelson, a similar structure lying athwart the main keelson, to support the engines and boilers.…
KEEP n.
jon. See Illust. of Castle. The prison strong, Within whose keep the captive knights were laid. Dryden. The lower chambers of those gloomy keeps. Hallam. I think . . . the keep, or principal part of a castle, was so called because the lord and his domestic circle kept, abode, or lived there. M. A. Lower.…