| a device consisting essentially of a spiral passage within an inclined cylinder for raising water to a height when rotated. |
Archimedean screw  (click for larger image in new window) n. An ancient apparatus for raising water, consisting of either a spiral tube around an inclined axis or an inclined tube containing a tight-fitting, broad-threaded screw. Also called Archimedes' screw. [After Archimedes.] |
