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invisible ink

noun
Origin
1675-1685
1675-85
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for invisible ink
  • On the side of the card, there's invisible ink, and each card is bar coded.
  • Because of this a companion invisible ink exercise was developed for this same problem.
British Dictionary definitions for invisible ink

invisible ink

noun
1.
a liquid used for writing that does not become visible until it has been treated with chemicals, heat, ultraviolet light, etc
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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Difficulty index for invisible ink

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Word Value for invisible

14
18
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