periscope

Etymology

From peri- + -scope.

noun

1. A form of viewing device that allows the viewer to see things at a different height level and usually with minimal visibility.
2. (obsolete): 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 […] 1885, Transactions of the Michigan State Medical Society, page 55

verb

1. (intransitive) 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. 1951, National Geographic Magazine: Volume 99
   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. 1987, Field & Stream March 1987
   Areas of barren sand are likely spots to look for its [the turtle's] periscoping head. Its fondness for the bottom is equally matched by its ability to quickly disappear and tunnel into it. 2008, Doug Stamm, The Springs of Florida, page 99
   Her black and white head suddenly popped out from under the covers and periscoped around. 2010, Jim Moran, The Sentinel: A Wildfire Story, page 236