a form of microfiche with the images greatly reduced in size, generally by a factor of 100 or more.
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British Dictionary definitions for ultrafiche
a sheet of film, usually the size of a filing card, that is similar to a microfiche but has a much larger number of microcopies
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