opticallantern
nounUK /ˈɒptɪkəl ˈlæntən/
US /ˈɑːptɪkəl ˈlæntərn/
A machine that shines light through pictures to make them look big on a wall.
Grandpa showed us old slides with an optical lantern in the dark room.
OTHER MEANINGS
2. An old-fashioned device that projects painted glass slides onto a screen.
The museum displayed an optical lantern from the 1800s.
3. A lamp that uses lenses or mirrors to focus its light into a bright beam.
The lighthouse keeper cleaned the optical lantern every morning.
4. A tool used in early science shows to cast enlarged images for teaching.
The teacher used an optical lantern to show tiny insects to the class.