viewmaster
nounUK /ˈvjuːˌmɑːstə/
US /ˈvjuːˌmæstər/
A toy that shows pictures in 3D when you look through it.
I looked at pictures of dinosaurs through my View-Master.
OTHER MEANINGS
2. A brand name for a device that shows stereoscopic images on a rotating reel.
The View-Master was first sold in 1939.
3. A person who watches a lot of television.
He's a real viewmaster, glued to the screen all day.
4. A software tool for viewing files or data.
The app includes a built-in viewmaster for images.