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See also: périscope


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Naval officer using a periscope


From peri- +‎ -scope.


periscope (plural periscopes)

  1. A form of viewing device that allows the viewer to see things at a different height level and usually with minimal visibility.
    • 1918, Edgar Rice Burroughs, The Land That Time Forgot Chapter IV
      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.
  2. (obsolete): A general or comprehensive view.
    • 1885, Transactions of the Michigan State Medical Society, page 55: 
      [] will show it not only enlarging the periscope of knowledge, but contributing to the amelioration of the condition of unfortunate and suffering humanity []


Related terms[edit]


periscope (third-person singular simple present periscopes, present participle periscoping, simple past and past participle periscoped)

  1. (intransitive) To rise and peer around, in the manner of a periscope.
    • 1951, National Geographic Magazine: Volume 99,
      Thousands of ungainly black-beaked heads would periscope and freeze in the direction of the approaching intruder.
    • 1987, Field & Stream March 1987,
      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.
    • 2008, Doug Stamm, The Springs of Florida page 99
      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.
    • 2010, Jim Moran, The Sentinel: A Wildfire Story page 236
      Her black and white head suddenly popped out from under the covers and periscoped around.