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Comprehensive
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box spring a cloth-covered bedspring having rows of individual but connected helical springs inside a boxlike frame.
screw a fastener, usu. metal, having a sometimes tapered shank with a helical thread, driven into a surface by applying pressure to the head while turning it. [6/17 definitions]
screw thread the continuous helical ridge or groove on the outer surface of a screw or the inner surface of a nut.
spiry2 spiral; coiled; helical.
thread the helical or spiral ridge on a screw or screwing device. [2/12 definitions]
worm gear a mechanism consisting of a shaft with a helical thread that meshes with a toothed wheel, usu. set at right angles to each other. [1/2 definitions]