stereopticon
noun
ste·re·op·ti·con ˌster-ē-ˈäp-ti-kən 
ˌstir-
1
: a projector for transparent slides often made double so as to produce dissolving views
2
: stereoscope
Example Sentences
Recent Examples on the Web The handheld or freestanding stereopticon allowed for a private viewing. 
Brenda Yenke, cleveland, 15 Oct. 2020 Some made use of pinhole cameras, others worked with stereopticon images. J. Hoberman, The New York Review of Books, 10 Sep. 2020
Brenda Yenke, cleveland, 15 Oct. 2020 Some made use of pinhole cameras, others worked with stereopticon images. J. Hoberman, The New York Review of Books, 10 Sep. 2020 Word History
Etymology
New Latin, from stere- + Greek optikon, neuter of optikos optic
First Known Use
1863, in the meaning defined at sense 1