periscopes
pe-ri-scopes
noun
Optical instruments allowing observation from a concealed or submerged position, typically in submarines.
"Submarines raise their periscopes to observe the surface."
Thesaurus
Synonyms: periscope
pe-ri-scopes
Optical instruments allowing observation from a concealed or submerged position, typically in submarines.
"Submarines raise their periscopes to observe the surface."
Synonyms: periscope