(historical) A kind of ventilating apparatus using a propeller.

plural of screw head

Alternative form of screwhead.

(surgery) A screw used for connecting vertebrae to rods in spinal surgery, having a spherical head enclosed in a housing that allows a range of motion along several different axes relative to the housing.

Alternative form of sod this for a game of soldiers

Alternative form of jackscrew

(hardware) A large metal wood screw with a hexagonal head.

A screw with a hexagonal head.

(slang) To be insane, irrational, or eccentric.

A screw, with a hardened thread, that forms its own internal thread when driven into a relatively soft material (such as sheet metal).