Etymology
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photostat (n.)

1909, a type of copying machine (trademark Commercial Camera Company, Providence, R.I.) whose name became a generic noun and verb (1914) for "photocopy;" from photo- + -stat.

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Definitions of photostat
1
photostat (v.)
make a copy by means of a Photostat device;
2
photostat (n.)
a photocopy made on a Photostat machine;
3
Photostat (n.)
a duplicating machine that makes quick positive or negative copies directly on the surface of prepared paper;
Synonyms: Photostat machine
From wordnet.princeton.edu