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invisible ink

noun

sympathetic ink.

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Nearby words

  1. invisibility,
  2. invisible,
  3. invisible balance,
  4. invisible glass,
  5. invisible hand,
  6. invisible man,
  7. invisible man, the,
  8. invisible shadow,
  9. invision,
  10. invita minerva

Origin of invisible ink

First recorded in 1675–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for invisible ink

invisible ink

noun

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