Definition of photostats:
(n) :
(UK, Ireland, Malaysia, Philippines) A photocopy made using a photocopier or Photostat machine.
(v) :
(transitive) To make such a photocopy of.
(n) :
Positive (black on white) or negative (white on black) reproduction of printed matter or artwork made on a photostat machine, which uses photographic paper instead of a transparent negative, and uses a prism to render the paper negative readable instead of reversed.