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 Samuel Edward Dibble

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