thread mark

American

noun

a thin threading in paper currency to make counterfeiting difficult.

thread mark British

noun

a mark put into paper money to prevent counterfeiting, consisting of a pattern of silk fibres

"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

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thread mark

On the stock there is a deep mark to correspond with the standard thread mark on the dies.

From Elements of Plumbing by Dibble, Samuel Edward

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023