photostatPronunciation: /ˈfəʊtə(ʊ)stat/Definition of photostat noun a type of machine for making photocopies on special paper. a copy made by a photostat. verb (photostats, photostatting, photostatted) [with object] copy (a document) with a photostat: he refused to let me photostat the bookDerivatives photostaticPronunciation: /-ˈstatɪk/ adjective photostat in other Oxford dictionaries Definition of photostat in the US English dictionary