One of the mysteries of the English language finally explained.
1A device used for raising water by means of the rotation of a helical surface within a closely fitting duct; Archimedes' Screw. More fully "Archimedes screw engine", "Archimedean screw engine". Now historical and rare.
2In a vessel: an engine that drives one or more screw propellers. Now rare and only in historical contexts.
Late 17th century (in an earlier sense). From screw + engine.
screw engine/ˈʃkruː ɛn(d)ʒ(ɪ)n/
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