noun
- optical devices that project images of both opaque objects and transparent slides onto a screen
Usage: technical; educational equipment
Examples
- The teacher used epidiascopes to display book pages to the entire class.
- Modern schools have largely replaced epidiascopes with digital projectors.
- The old epidiascopes in the library could project both photographs and slides.
- Before computers, epidiascopes were essential tools for classroom presentations.
- The museum’s vintage epidiascopes demonstrated early projection technology.
- Epidiascopes allowed teachers to share printed materials with large groups of students.