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security thread

a colored thread running through the paper of a piece of paper money, used to deter counterfeiting. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for security thread
  • The security thread indicating the bill's denomination is now located in a different position on each denomination.
  • The major change to prevent counterfeiting was to move the security thread from the left of the portrait to the right.
  • The second feature is the security thread which runs vertically on the note and can be seen from both sides.

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