microprint

micro- +‎ print

microprint (countable and uncountable, plural microprints)

1. (uncountable) Extremely small print
   • 1994, Rudolf L Van Renesse, Optical Document Security:

     To this end, for instance, microprint may be used, which is beyond the resolution of copying systems but requires a magnifier to be verified.

2. (countable) A document bearing a microreproduction of printed text

• microprinter