periscope
/ˈpɛrɪskoʊp/
noun
- A tube with mirrors or prisms that allows someone to see over or around an obstacle, especially used in submarines to see above the water.
- The submarine captain raised the periscope to check for enemy ships.
- The soldier used a periscope to look over the trench without exposing his head.
- During the science fair, the student built a simple periscope using cardboard and mirrors.
Synonyms