Other forms: screwed; screws; screwing
A screw is a small metal rod with a notch in the top that's used as a fastener. You can attach one piece of wood to another by rotating a screw through the two surfaces.
A screw is similar to a nail, but instead of hammering it in, you turn it repeatedly with a screwdriver. The spiral ridges of a screw attach it securely to whatever you screw it into — metal, wood, or a bolt with similar ridges. Etymologists aren't sure about the origins of screw, although some suspect it comes from the Latin scrobis, "ridge or trench."