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Related to ultrafiche: microfilms
(Communications & Information) 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
[C20: from ultra- + French fiche small card. See microfiche]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a form of microfiche with the images greatly reduced in size, generally by a factor of 100 or more.
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