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bed screw
(nautical) A form of jack screw for lifting large bodies and assisting in launching. / A long screw formerly used to fasten a bedpost to one of the adjacent side pieces.
breech screws
plural of breech screw
Archimedes' screws
Archimedean screws
bed screws
Archimedes' screw
(engineering) A screwlike device invented by Greek mathematician Archimedes, ca. 200 B.C.E., which when twisted inside a cylinder, raises water from a lower level to a higher level, allowing irrigation of fields.
turn the screw
(idiomatic) To increase the pressure of a situation.
( present singular third-person )
( participle present )
( participle past )
( past )
screw machine
A machine for the manufacture of screws, typically either by carving a groove into a thick nail, or by welding a thread formed of wire to a thin nail.
screw ventilators
plural of screw ventilator