Definition of thread mark in English:

thread mark

Line breaks: thread mark

noun

A mark in the form of a thin line made in banknote paper with highly coloured silk fibres to prevent photographic counterfeiting.
More example sentences
  • All the images made with these lenses are unique, with the thread marks acting as a sort of marking of territory.

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Word of the day humoresque
Pronunciation: ˌhjuːməˈrɛsk
noun
a short, lively piece of music