a thin threading in paper currency to make counterfeiting difficult.
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How To Use Punctuation MarksPunctuation marks have a lot of different uses. The period, question mark, and exclamation point are used to end sentences. The comma, semicolon, colon, and dash indicate a pause or break. Parentheses contain words, while hyphens combine them. Apostrophes show the omission of letters, and also show possession. Ending a Sentence A period (.) ends any sentence that forms a statement. Periods are also used …
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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