periscope
UK: ˈper.ɪ.skəʊp | US: ˈper.ɪ.skoʊp
n. an optical instrument with mirrors or prisms allowing an observer to see objects not in the direct line of sight, especially used in submarines.
The word periscope combines Greek roots to describe its function: peri- ("around") + -scope ("to look"). It emerged in the 19th century, originally for military use, enabling users to "look around" obstacles (e.g., submarine crews viewing above water). The logical fusion reflects its purpose—circular observation.
The submarine captain raised the periscope to scan the horizon.
Soldiers used a periscope to observe enemy movements from the trench.
Modern periscopes often incorporate advanced optics for clearer images.
The child crafted a simple periscope from cardboard and mirrors.
Engineers improved the periscope’s design to reduce distortion.