a hook having a shank in the form of a screw.
noun 1. jackscrew. noun 1. a lifting device utilizing the mechanical advantage of a screw thread, the effort being applied through a bevel drive Also called jackscrew, jack
noun, Nautical. 1. patent log. noun, Nautical. 1. any of various devices for determining the speed of a ship by means of a vaned rotor streamed at the end of a log line upon which it exerts a torsion transmitted to a registering device on board. noun 1. (nautical) any of several mechanical devices for […]
noun, Nautical. 1. mooring screw. mooring screw noun, Nautical. 1. a broad, augerlike anchor used for securing buoys in soft-bottomed lakes, rivers, etc.