screw thread

Also called worm. the helical ridge of a screw.
a full turn of the helical ridge of a screw.

1805–15 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
screw thread
the helical ridge on a screw formed by a die or lathe tool

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Specifically defined screw thread used on fire hose couplings.
The specific dimensions of screw thread employed to coupled fire hose and equipment.
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