a thin threading in paper currency to make counterfeiting difficult.
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You may have read the word "simmer" in a recipe or two, but what does it really mean?
Words nearby thread mark
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
British Dictionary definitions for thread mark
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