Definition of "photostat"

(dated) A photocopy, especially one made by a Photostat machine.  examples

(Malaysia, Philippines) A photocopy made using a photocopier.  examples

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.  examples

(transitive) To make such a photocopy of.  quotations  examples