lead screw

[ leed ]
/ lid /

noun

(on a lathe) a rotating horizontal screw for moving the tool carriage along the work at a constant rate.

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British Dictionary definitions for lead screw

lead screw
/ (liːd) /

noun

a threaded rod that drives the tool carriage in a lathe when screw cutting, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012