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Archimedes’ screw
Ar·chi·me·des' screw (plural Ar·chi·me·des' screws)


noun 
Definition:
 
engineering 
Same as  Archimedean screw
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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