periscope

noun

Pronunciation: /ˈpɛɹɪskəʊp/ / /ˈpɛɹɪskoʊp/ / /ˈpeɹɪskəʉp/

Etymology: Formed in English from peri- + -scope.

A form of viewing device that allows the viewer to see things at a different height level and usually with minimal visibility.
“The waters grew suddenly lighter, and my spirits rose accordingly. I shouted down to those below that I saw daylight ahead, and a great shout of thanksgiving reverberated through the ship. A moment later we emerged into sunlit water, and immediately I raised the periscope and looked about me upon the strangest landscape I had ever seen.”
A general or comprehensive view.
“[…] will show it not only enlarging the periscope of knowledge, but contributing to the amelioration of the condition of unfortunate and suffering humanity […]”

Etymology: Formed in English from peri- + -scope.

To rise and peer around, in the manner of a periscope.
“Thousands of ungainly black-beaked heads would periscope and freeze in the direction of the approaching intruder.”
“The second summer I had a great deal of interest but weeks passed before I worked up the nerve to approach her, the confidence finally gained when I caught a queen snake that periscoped within reach, one of the last I ever saw swimming in Cross Creek.”