Meaning

noun someone who guards prisoners

noun a simple machine of the inclined-plane type consisting of a spirally threaded cylindrical rod that engages with a similarly threaded hole

noun a propeller with several angled blades that rotates to push against water or air

originFrom Middle English screw, scrue (“screw”); apparently, despite the difference in meaning, from Old French escroue (“nut, cylindrical socket, screwhole”), from Latin scrōfa (“female pig”) through comparison with the corkscrew shape of a pig's penis. There is also the Old French escruve (“screw”), from Old Dutch *scrūva ("screw"; whence Middle Dutch schruyve (“screw”)), which probably influenced…

Etymology from Wiktionary, CC BY-SA 3.0